Public hospital admissions for treating complications of clinical care: incidence,costs and funding strategy

Objective: To quantify the frequency of, and the costs and payments associated with, admissions for treatment of injuries and illnesses that are consequences of care. Data sources: Routinely‐coded 2005/06 public hospital inpatient data from Victoria, Australia (1.25 million admissions) and corresponding patient‐level cost data (1.04 million admissions). Payments reflected DRG‐based prospective rates. Study design: Retrospective analysis of admissions with principal diagnoses that specify adverse events arising as a direct consequence of healthcare. Results: 1.5% (15,336) of the costed admissions specifically treat an injury or illness arising from medical or surgical care, consuming 2.74% of hospital prospective payments and representing $89.3 m (2.84%) of total reported costs. 1.4% (17,429) of all public hospital admissions and 2.82% of hospital prospective payments (estimated cost‐$101.5 m per year) are committed to treating complications of care. Private residences or aged care facilities are the source of 84.9% (14,804) of these admissions. Inpatient death was the outcome in 0.7% (118) of these admissions. Implications: Admissions for treating complications of care represent a small, relatively expensive, proportion of hospital admissions, which account for disproportionate levels of hospital costs and funding. A policy option providing incentives to reduce the incidence and costs of complications arising from care includes allocating all costs arising from transferred (re)admissions back to the original episode of care and developing a suite of specific DRGs to fund admissions for treatment of complications.     

Hospitalisations,admission costs and re‐fracture risk related to osteoporosis in Western Australia are substantial: a 10‐year review

Objective: To quantify hospitalisation costs to Western Australia (WA) for osteoporosis‐related fractures and estimate risk of readmission after incident fracture. Methods: All hospitalisation records for WA residents aged ≥50 years admitted to a WA hospital between 2002 and 2011 due to osteoporotic fractures were extracted from the WA Hospital Morbidity Data System. Data linkage enabled identification of the first (index) fracture admission, determination of subsequent osteoporotic fracture‐related readmissions, and quantification of total admission costs and bed days. Cox proportional hazard models assessed factors influencing first readmission. Results: A total of 5,326 patients were admitted to WA hospitals for an index fracture. Of the 2,037 (38.2%) patients who sustained a re‐fracture requiring readmission, 1,223 (23.0%) had one re‐fracture episode, 453 (8.5%) has two, and 361 (6.8%) has three or more re‐fracture episodes requiring readmission. Cost of index admissions was $57,007,262 while $48,948,623 was associated with readmissions (CPI‐adjusted to 2011/12). Cumulative probability of readmission within six months of the index admission was 20% (males) and 17% (females). Conclusions: Osteoporotic fracture‐related hospitalisations impose a substantial financial impact on WA, exceeding $100 million in a decade. Implications: Considering the large system costs, policy and programs to improve identification of index fractures and initiation of osteoporosis treatments and primary prevention initiatives are justified.     

Economic burden of hospital admissions for patients with acute bacterial skin and skin structure infections in the United States

ABSTRACT

Objectives: We estimated the total US hospital costs associated with acute bacterial skin and skin structure infection (ABSSSI) admissions as well as the admissions that may have been potential candidates for outpatient parenteral antimicrobial therapy (OPAT).

Methods: We assessed inpatient admissions for ABSSSI from the Premier database (2011–2014), focusing on all admissions of adults with length of stay (LOS) ≥ 1 days and a primary diagnosis of erysipelas, cellulitis/abscess, or wound infection. We performed a detailed analysis of 2014 admissions for patient, treatment, hospital, and economic characteristic variables. Using published selection criteria, we identified a subset of patients admitted in 2014 who may have been potential candidates for OPAT.

Results: We analyzed 277,971 admissions. In 2014, most admissions were for cellulitis without major complications or comorbidities; mean ± SD LOS was 4.0 ± 3.0 days, and total hospital cost per admission was $6400 ± $6874, 54% of which was attributable to room costs. Among 2014 admissions, 14% involved patients with clinical characteristics suggesting that they were consistent with guideline recommendations for exclusive treatment with OPAT. Compared with all admissions in the year, these admissions were of younger patients (aged 50 vs. 55 years), admitted more frequently for cellulitis (90% vs. 70%), with shorter LOS (2.8 ± 1.8 days), and lower mean total hospital cost per admission ($4080 ± $3066).

Conclusions: Admissions for ABSSSI impose a substantial cost to US hospitals, with half of costs attributable to room costs. When extrapolated to all US patients admitted to the hospital for ABSSSI during 2014, had OPAT guidelines been universally followed, admissions may have been reduced by 14%, thereby saving US hospitals $161 million.     

Reduction of Acute Low Back Injuries by Use of Back Supports

Abstract

The objective of this study was to determine the effect of a change in back-support-use policy on the occurrence of work related low back injuries among a large cohort of employees in the retail-trade home improvement industry. Working hours of exposure, back support use, and intensity of materials-lifting requirements were collected from 1989 through 1994. Records of injury-related claims were reviewed for all documented injuries to the lower back among members of the cohort during the same period. Over 101,000,000 working hours were recorded by nearly 36,000 employees; 2,152 employees reported an acute low back injury occurring during working hours as a first report of episode, with medical-physician diagnosis and acute/abrupt onset. Incidence density rates were calculated for persons wearing and not wearing the back support. Rate ratios and prevented fractions were evaluated. Before implementation of a company-wide back-support policy, the employees had a rate of acute low back injuries of 30.6 per million working hours. After implementation, this rate fell to 20.2 per million working hours, a significant reduction of 34.0%. This effect was seen in both genders, in younger workers and in those aged 55 +, with low levels of lifting as well as high lifting intensities, and in persons with one to two years of employment with the company. The authors conclude that uniform mandatory implementation of a back-support-use policy significantly reduces the incidence of acute low back injuries incurred in the workplace.     

Variation in management of community-acquired pneumonia requiring admission to Alberta,Canada hospitals

Previous studies have shown small area variation in the rate of admission to hospital for patients with community-acquired pneumonia. We determined the rates of admission and length of stay for patients with community-acquired pneumonia in Alberta and the factors influencing admission rates and length of stay. Using hospital abstracts, hospital admissions for community-acquired pneumonia from 1 April 1994 to 31 March 1999 were compared. We classified Alberta hospitals according to geographical regions, by the number of beds, and by number of community-acquired pneumonia cases. There were 12,000 annual hospital discharges for community-acquired pneumonia costing over $40 million per year. The overall in-hospital mortality rate was 12% and the 1 year mortality rate was 26%. Compared with rural hospitals, regional and metropolitan hospitals admitted patients with greater severity of illness as demonstrated by greater in-hospital mortality, cost per case and comorbidity. Age-sex adjusted hospital discharge rates were significantly below the provincial average in both urban regions. Hospital discharge rates for residents in all rural regions and 4 of 5 regions with a regional hospital were significantly higher than the provincial average. After adjusting for comorbidity, the relative risk for a longer length of stay was 22% greater in regional hospitals and about 30% greater in urban hospitals compared to rural hospitals. Seasonal variation in the admission rate was evident, with higher rates in the winter of each year. We conclude that rural hospitals would be likely to benefit from a protocol to help with the admission decision and urban hospitals from a programme to reduce length of stay.     

A prospective study of the costs of falls in older adults living in the community

OBJECTIVE: To establish the hospital cost and three-month, post-hospital community and personal costs associated with older adults discharged to the community after a fall. The timing, incidence and the determinants of these costs to the various sectors were also examined. METHODS: Patients who attended the Emergency. Department of a teaching hospital in Perth, Western Australia, were asked to complete a daily diary for three months of all community and informal care they received due to their fall and any associated expenses. Unit costs were collected from various sources and used to estimate the cost of community and informal care. Hospital inpatient costs were estimated using a patient-based costing system. RESULTS: Seventy-nine patients participated with a total estimated falls-related cost for the three-month period of $316,155 to $333,648 (depending on assumptions used) and a mean cost per patient of between $4,291 and $4,642. The hospital cost accounted for 80%, community costs 16% and personal costs 4% of the total. Of community and personal costs, 60% was spent in the first month. Type of injury was the most significant determinant of hospital and community costs. Extrapolating these figures to the WA population provided an estimate of the total hospital and three-month, post-hospital cost of falls of $24.12 million per year, with $12.1 million funded by the Federal Government, $10.1 million by State/local government and $1.7 million in out-of pocket expenses by patients. CONCLUSION: In the acute and immediate post-discharge period, hospital costs accounted for most of the cost of care for older adults discharged to the community after a fall. Community and personal costs, however, were also incurred. The cost estimates provide useful information for planners of hospital and community care for older people who have sustained a fall.     

Influenza and adult hospital admissions for respiratory conditions in England 1989-2001

Influenza is recognised as a major cause of excess hospital admissions during winter months. This study sets out to quantify admissions related to influenza during the last twelve winters and to examine the importance of age. Total admission data for respiratory disorders in adults for England during the years 1989 to 2001 have been used. Weekly admission data were examined in five-year age bands. Influenza epidemics were identified from clinical incidence data in the community. Baseline admission levels were determined by averaging weekly incidence data from weeks in which there was no clinical evidence of influenza activity. Excess admissions were estimated from the difference between observed and baseline admissions after adjusting the baseline in each group and year for the secular trend. Estimates for all adults were consolidated from the five-year age bands. Bed occupancy was estimated by applying data on average bed stay to excess admissions in age- and year-specific groups. We estimated 2.7% of all respiratory admissions were related to influenza. Excess admissions were strongly age related. Of the 16,227 annual average excess, 52% occurred in persons over 75 years. The excess admissions account for an average 145,544 bed days annually, two thirds (69%) in persons over 75 years. Annual excess bed occupancy was highest in 1999/2000 (39,512) though 30,000 excess admissions per year is not unusual. Hospital admissions due to influenza remain a major problem for health service delivery particularly in elderly populations. Though robust programmes of vaccination are needed, vaccination by itself will not eliminate the impact of influenza on hospital admissions in winter.     

PMH2 Assessment of Health-Related Quality of Life During Treatment of Opiate Dependence using the Short Form-36

In the U.S., acute general hospitals increasingly provide treatment for patients with schizophrenia.
OBJECTIVE: To estimate the average annual cost of inpatient schizophrenia care per patient in an acute general hospital setting.
METHODS: Using ICD9 codes to identify disease and procedure-level data in five state (CA, FL, MA, MD, NC) acute care, all payer, discharge databases, an average cost per admission was estimated and combined with the frequency of admission calculated from the MA database to derive a mean annual acute care inpatient cost. Physician costs were calculated by applying 1997 Medicare fees to a resource use profile derived from the databases and published treatment recommendations. All costs are reported in 1997 US$, appropriately adjusted for medical inflation and cost-to-charge ratios.
RESULTS: Of 7.5 millions discharges, 73,000 were identified as having been admitted primarily due to schizophrenia. The average length of stay was 13.5 days, with 90% of time spent in a designated psychiatric bed. Over 90% were discharged within one month, most (∼80%) to home without documentation of further services. The mean cost per stay (including physician fees) was $8,963. Most (68%) patients had only one admission, and 96% had less than five in one year, leading to annual hospitalization cost per schizophrenic patient of $13,854.
CONCLUSIONS: Of schizophrenic patients admitted to an acute general hospital, the majority are admitted only once per year, spend their stay in a designated psychiatric unit bed, and are discharged within two weeks. Although these patients may have subsequent admissions to another type of inpatient facility, the majority are not transferred to such a facility at the time of discharge.     

National Hospital Ambulatory Medical Care Survey: 2004 emergency department summary

OBJECTIVES: This report describes ambulatory care visits to hospital emergency departments (EDs) in the United States in 2004. Statistics are presented on selected hospital, patient, and visit characteristics. Selected trends in ED utilization from 1994 through 2004 are also presented. METHODS: The data presented in this report were collected in the 2004 National Hospital Ambulatory Medical Care Survey (NHAMCS), a national probability sample survey of visits to emergency and outpatient departments of non-Federal, short-stay, and general hospitals in the United States. Sample data are weighted to produce annual national estimates. RESULTS: During 2004, an estimated 110.2 million visits were made to hospital EDs, about 38.2 visits per 100 persons. Visit rates have shown an increasing trend since 1994 for persons aged 22-49 years, 50-64 years, and 65 years and over. In 2004, more than 16 million patients arrived by ambulance (15.1 percent). At approximately 3 percent of visits, the patient had been seen in the ED within the last 72 hours. Abdominal pain, chest pain, fever, and back symptoms were the leading patient complaints, accounting for nearly one-fifth of all visits. Abdominal pain was the leading illness-related diagnosis at ED visits. There were an estimated 41.4 million injury-related visits or 14.4 visits per 100 persons. Diagnostic and screening services were provided at 89.9 percent of ED visits. Procedures were performed at 47.7 percent, and medications were prescribed at 78.4 percent of ED visits. Approximately 13 percent of ED visits resulted in hospital admission. On average, patients spent 3.3 hours in the ED, of which 47.4 minutes were spent waiting to see a physician.     

Motorcycle helmet use and injury outcome and hospitalization costs from crashes in Washington State.

OBJECTIVES. The incidence, type, severity, and costs of crash-related injuries requiring hospitalization or resulting in death were compared for helmeted and unhelmeted motorcyclists. METHODS. This was a retrospective cohort study of injured motorcyclists in Washington State in 1989. Motorcycle crash data were linked to statewide hospitalization and death data. RESULTS. The 2090 crashes included in this study resulted in 409 hospitalizations (20%) and 59 fatalities (28%). Although unhelmeted motorcyclists were only slightly more likely to be hospitalized overall, they were more severely injured, nearly three times more likely to have been head injured, and nearly four times more likely to have been severely or critically head injured than helmeted riders. Unhelmeted riders were also more likely to be readmitted to a hospital for follow-up treatment and to die from their injuries. The average hospital stay for unhelmeted motorcyclists was longer, and cost more per case; the cost of hospitalization for unhelmeted motorcyclists was 60% more overall ($3.5 vs $2.2 million). CONCLUSIONS. Helmet use is strongly associated with reduced probability and severity of injury, reduced economic impact, and a reduction in motorcyclist deaths.     

The economic impact of methicillin-resistant Staphylococcus aureus in Canadian hospitals.

OBJECTIVES: To determine the costs associated with the management of hospitalized patients with methicillin-resistant Staphylococcus aureus (MRSA), and to estimate the economic burden associated with MRSA in Canadian hospitals. DESIGN: Patient-specific costs were used to determine the attributable cost of MRSA associated with excess hospitalization and concurrent treatment. Excess hospitalization for infected patients was identified using the Appropriateness Evaluation Protocol, a criterion-based chart review process to determine the need for each day of hospitalization. Concurrent treatment costs were identified through chart review for days in isolation, antimicrobial therapy, and MRSA screening tests. The economic burden to Canadian hospitals was estimated based on 3,167,521 hospital discharges for 1996 and 1997 and an incidence of 4.12 MRSA cases per 1,000 admissions. SETtING: A tertiary-care, university-affiliated teaching hospital in Toronto, Ontario, Canada. PATIENTS: Inpatients with at least one culture yielding MRSA between April 1996 and March 1998. RESULTS: A total of 20 patients with MRSA infections and 79 colonized patients (with 94 admissions) were identified. This represented a rate of 2.9 MRSA cases per 1,000 admissions. The mean number of additional hospital days attributable to MRSA infection was 14, with 11 admissions having at least 1 attributable day. The total attributable cost to treat MRSA infections was $287,200, or $14,360 per patient The cost for isolation and management of colonized patients was $128,095, or $1,363 per admission. Costs for MRSA screening in the hospital were $109,813. Assuming an infection rate of 10% to 20%, we determined the costs associated with MRSA in Canadian hospitals to be $42 million to $59 million annually. CONCLUSIONS: These results indicate that there is a substantial economic burden associated with MRSA in Canadian hospitals. These costs will continue to rise if the incidence of MRSA increases further.     

Post-earthquake injuries treated at a field hospital --- Haiti, 2010

On January 12, 2010, a 7.0-magnitude earthquake struck Haiti, resulting in an estimated 222,570 deaths and 300,000 persons with injuries. The University of Miami Global Institute/Project Medishare (UMGI/PM) established the first field hospital in Port-au-Prince, Haiti, after the earthquake. To characterize injuries and surgical procedures performed by UMGI/PM and assess specialized medical, surgical, and rehabilitation needs, UMGI/PM and CDC conducted a retrospective medical record review of all available inpatient records for the period January 13-May 28, 2010. This report describes the results of that review, which indicated that, during the study period (when a total of 1,369 admissions occurred), injury-related diagnoses were recorded for 581 (42%) admitted patients, of whom 346 (60%) required a surgical procedure. The most common injury diagnoses were fractures/dislocations, wound infections, and head, face, and brain injuries. The most common injury-related surgical procedures were wound debridement/skin grafting, treatment for orthopedic trauma, and surgical amputation. Among patient records with documented injury-related mechanisms, 162 (28%) indicated earthquake-related injuries. Earthquake preparedness planning for densely populated areas in resource-limited settings such as Haiti should account for injury-related medical, surgical, and rehabilitation needs that must be met immediately after the event and during the recovery phase, when altered physical and social environments can contribute to a continued elevated need for inpatient management of injuries.     

National Hospital Ambulatory Medical Care Survey: 2002 emergency department summary

OBJECTIVES: This report describes ambulatory care visits to hospital emergency departments (EDs) in the United States. Statistics are presented on selected hospital, patient, and visit characteristics. Selected trends in ED utilization from 1992 through 2002 are also presented. METHODS: The data presented in this report were collected from the 2002 National Hospital Ambulatory Medical Care Survey (NHAMCS). NHAMCS is part of the ambulatory care component of the National Health Care Survey that measures health care utilization across various types of providers. NHAMCS is a national probability sample survey of visits to emergency and outpatient departments of non-Federal, short-stay, and general hospitals in the United States. Sample data are weighted to produce annual national estimates. RESULTS: During 2002, an estimated 110.2 million visits were made to hospital EDs, about 38.9 visits per 100 persons. From 1992 through 2002, an increasing trend in the ED utilization rate was observed for persons over 44 years of age. In 2002, abdominal pain, chest pain, fever, and cough were the leading patient complaints accounting for nearly one-fifth of all visits. Acute upper respiratory infection was the leading illness-related diagnosis at ED visits. From 1992 through 2002, decreases in ED visit rates were observed for intracranial injuries in children, and increases were found for depression in young adults and arthropathies among middle-aged and elderly patients. There were an estimated 39.2 million injury-related visits during 2002, or 13.8 visits per 100 persons. Diagnostic/screening services, procedures, and medications were provided at 86.8 percent, 43.2 percent, and 75.8 percent of visits, respectively. In 2002, approximately 12 percent of ED visits resulted in hospital admission. On average, patients spent 3.2 hours in the ED.     

Hospital costs associated with agricultural machinery injuries in Ontario

To assist those responsible for agricultural safety, we: (1) piloted an approach to costing hospitalized farm injuries; and, (2) described ambulance and inpatient costs associated with these injuries in Ontario. Hospital discharge records (hospital separations) for farm machinery injuries in Ontario (n = 1,610) were identified by ICD9-CM E-codes for 1985–1993. Ambulance costs were estimated by the Ontario Ministry of Health. For each case, the hospital costs were calculated by multiplying the case-specific resource intensity weight by the average inpatient cost per weighted case. The costs (1993 Canadian dollars) ranged from $768 to $62,643 and totaled $6.9 million over the study period. Males accounted for 89.8% of the total costs. Tractor injuries accounted for a large proportion of costs (34.3%). The median costs per case varied by type of machinery, ranging from $2,043 for ploughs/disks to $3,366 for augers. Entanglement injuries were responsible for the largest proportion of costs (40.7%), while tractor rollovers accounted for the highest median cost ($3,065). Although these figures represent a fraction of the total costs associated with farm injuries, the results provide one basis from which to justify and target preventive initiatives. This approach to costing may also be widely applicable to other health issues. Am. J. Ind. Med. 32:502–509, 1997. © 1997 Wiley-Liss, Inc.     

The economic burden of idiopathic pulmonary fibrosis in Australia: a cost of illness study

Purpose

Idiopathic pulmonary fibrosis (IPF) is a type of interstitial lung disease found mostly in elderly persons, characterized by a high symptom burden and frequent encounters with health services. This study aimed to quantify the economic burden of IPF in Australia with a focus on resource utilization and associated direct costs.

Methods

Participants were recruited from the Australian IPF Registry (AIPFR) between August 2018 and December 2019. Data on resource utilization and costs were collected via cost diaries and linked administrative data. Clinical data were collected from the AIPFR. A “bottom up” costing methodology was utilized, and the costing was performed from a partial societal perspective focusing primarily on direct medical and non-medical costs. Costs were standardized to 2021 Australian dollars ($).

Results

The average annual total direct costs per person with IPF was $31,655 (95% confidence interval (95% CI): $27,723–$35,757). Extrapolating costs based on prevalence estimates, the total annual costs in Australia are projected to be $299 million (95% CI: $262 million–$338 million). Costs were mainly driven by antifibrotic medication, hospital admissions and medications for comorbidities. Disease severity, comorbidities and antifibrotic medication all had varying impacts on resource utilization and costs.

Conclusion

This cost-of-illness study provides the first comprehensive assessment of IPF-related direct costs in Australia, identifies the key cost drivers and provides a framework for future health economic analyses. Additionally, it provided insight into the major cost drivers which include antifibrotic medication, hospital admissions and medications related to comorbidities. Our findings emphasize the importance of the appropriate management of comorbidities in the care of people with IPF as this was one of the main reasons for hospitalizations.

     

Home injuries among adults in Stavanger, Norway.

Norwegian injury register data were analyzed to examine unintentional home injuries among persons ages 25 to 64 years residing in Stavanger, Norway, during 1992. A total of 782 persons received medical treatment for injury during 1992 (15.4 per 1000 population). The incidence was similar for males and females (15.8 and 14.9 per 1000 population); however, the exposure-specific injury rate was significantly higher for males (6.0 vs 4.1 per 1 million person-hours). This difference was entirely due to the much higher injury rate among males aged 25 to 44 years. The estimated first year cost (direct and indirect) per injury was $2700. Home injuries among adults appear to be an overlooked public health problem that warrants increased attention.     

Source of admission and cost: public hospitals face financial risk.

We studied all admissions to the 11 acute care hospitals of the New York City Health and Hospitals Corporation (April 1983-September 1984) matching emergency room (ER) admitted diagnostic related group (DRG) subgroups in each hospital with at least five non-ER admitted patients (N = 222,961). Mean cost per ER patient ($8,385) was greater than non-ER mean cost per patient ($4,386) for Medicare and non-Medicare. Our data suggest that public hospitals with a high proportion of ER admissions may be at a financial disadvantage under DRG reimbursement.     

Costs and benefits of measures to prevent needlestick injuries in a university hospital.

OBJECTIVE: To document the costs and the benefits (both in terms of costs averted and of injuries averted) of education sessions and replacement of phlebotomy devices to ensure that needle recapping did not take place. DESIGN: The percentage of recapped needles and the rate of needlestick injuries were evaluated in 1990 and 1997, from a survey of transparent rigid containers in the wards and at the bedside and from a prospective register of all injuries in the workplace. Costs were computed from the viewpoint of the hospital. Positive costs were those of education and purchase of safer phlebotomy devices; negative costs were the prophylactic treatments and follow-up averted by the reduction in injuries. SETTING: A 1,050-bed tertiary-care university hospital in the Paris region. RESULTS: Between the two periods, the proportion of needles seen in the containers that had been recapped was reduced from 10% to 2%. In 1990, 127 needlestick (12.7/100,000 needles) and 52 recapping injuries were reported versus 62 (6.4/100,000 needles) and 22 in 1996 and 1997. When the rates were related to the actual number of patients, the reduction was 76 injuries per year. The total cost of information and preventive measures was $325,927 per year. The cost-effectiveness was $4,000 per injury prevented. CONCLUSION: Although preventive measures taken to ensure reduction of needlestick injuries appear to have been effective (75% reduction in recapping and 50% reduction in injuries), the cost of the safety program was high.     

National Hospital Ambulatory Medical Care Survey: 2005 emergency department summary

OBJECTIVE: This report presents the most current (2005) nationally representative data on visits to hospital emergency departments (ED) in the United States. Statistics are presented on selected hospital, patient, and visit characteristics. Selected trends in ED utilization from 1995 through 2005 are also presented. METHODS: Data are from the 2005 National Hospital Ambulatory Medical Care Survey (NHAMCS), the longest continuously running nationally representative survey of hospital ED and outpatient department (OPD) utilization. The NHAMCS collects data on visits to emergency and outpatient departments of nonfederal, short-stay, and general hospitals in the United States. Sample data are weighted to produce annual national estimates. RESULTS: During 2005, an estimated 115.3 million visits were made to hospital EDs, about 39.6 visits per 100 persons. This represents on average roughly 30,000 visits per ED in 2005, a 31 percent increase over 1995 (23,000). Visit rates have shown an increasing trend since 1995 for persons 22-49 years of age, 50-64 years of age, and 65 years of age and over. In 2005, about 0.5 million (0.4 percent) of visits were made by homeless individuals. Nearly 18 million patients arrived by ambulance (15.5 percent). At 1.9 percent of visits, the patient had been discharged from the hospital within the previous 7 days. Abdominal pain, chest pain, fever, and cough were the leading patient complaints, accounting for nearly one-fifth of all visits. Abdominal pain was the leading illness-related diagnosis at ED visits. There were an estimated 41.9 million injury-related visits or 14.4 visits per 100 persons. Diagnostic and screening services were provided at 71.1 percent of visits, and procedures were performed at 47.3 percent of visits. Medications were either given in the ED or prescribed at discharge at 76.7 percent of visits, resulting in 204.9 million drug mentions. On average, patients spent 56.3 minutes waiting to see a physician, and 3.3 hours for the full duration of their ED visit. About 12 percent of ED visits resulted in hospital admission. The average total length of stay for those admitted was 5.2 days, and the leading principal hospital discharge diagnosis was nonischemic heart disease.