Social support and health-related quality of life in hip and knee osteoarthritis

OBJECTIVE: To document the association between social support and health-related quality of life (HRQoL) in hip and knee osteoarthritis (OA). METHODS: A prospective survey including the SF-36 and the Social Support questionnaire (SSQ) was administered to 108 hip and knee OA patients attending an outpatient physical rehabilitation and rheumatology clinic. Multiple regression analysis were performed to study the relation between social support and each dimension of the SF-36, controlling for age, sex, body mass index, number of comorbid conditions, socioeconomic status, site of survey completion and severity of OA which was gauged with the pain dimension of the WOMAC, an OA-specific health status instrument. RESULTS: Greater social companionship transactions were associated with higher physical functioning (standardized regression coefficients: beta = 0.26, p < 0.01), general health (beta = 0.32, p < 0.001), mental health (beta = 0.25, p < 0.01), social functioning (beta = 0.20, p < 0.05) and vitality (beta = 0.25, p < 0.05). Satisfaction with problem-oriented emotional support was related to better physical functioning (beta = 0.22, p < 0.01), mental health (beta = 0.38, p < 0.001), role-emotional (B = 0.23, p < 0.01), social functioning (beta = 0.19, p < 0.05) and vitality (beta = 0.26, p < 0.01). CONCLUSION: Social support components significantly account for HRQoL. Health interventions in OA, primary dedicated to pain and physical disability, could be supplemented with social support component to enhance health outcomes.     

The CarerQol instrument: A new instrument to measure care-related quality of life of informal caregivers for use in economic evaluations

The societal perspective in economic evaluations dictates that costs and effects of informal care are included in the analyses. However, this incorporation depends on practically applicable, reliable and valid methods to register the impact of informal care. This paper presents the conceptualisation and a first test of the CarerQol instrument, aimed at measuring care-related quality of life in informal caregivers. The instrument combines the information density of a burden instrument (encompassing seven important burden dimensions) with a valuation component (a VAS scale for happiness). The instrument was tested in a Dutch sample of heterogeneous caregivers (n = 175) approached through regional caregiver support centres. This first test describes the feasibility as well as convergent and clinical validity of the CarerQol instrument. The seven burden dimensions related well with differences in VAS scores. In all instances, the average CarerQol-VAS scores decreased as the severity of problems increased. Multivariate analyses showed that the seven burden dimensions explained 37–43% of the variation in CarerQol-VAS scores, depending on the model used. The CarerQol seems a promising new instrument to register the impact of informal caregivers in economic evaluations.     

The Mini-OAKHQOL for knee and hip osteoarthritis quality of life was obtained following recent shortening guidelines

ObjectivesTo develop a short form of the knee and hip osteoarthritis quality of life questionnaire, the Mini-OAKHQOL, preserving the conceptual model and, as far as possible, the content and the psychometric properties of the original instrument.Study Design and SettingA two-step shortening procedure was used: (1) a consensus Delphi method, with a panel of patients and another of professionals independently asked to select items and (2) a nominal group, where patients, professionals, and methodologists reached consensus on the final selection of items, using information from the panels and from modern measurement and classical test theory analyses. The psychometric properties of the Mini-OAKHQOL were assessed in an independent population-based sample of 581 subjects with knee or hip osteoarthritis.ResultsThe two-step shortening procedure resulted in a 20-item questionnaire. Confirmatory factor analysis showed preservation of the original five-dimensional structure. Rasch analyses showed the unidimensionality and invariance by sex, age, and joint of the main dimensions. Convergent validity, reproducibility, and internal consistency were similar to or better than those of the original OAKHQOL.ConclusionsThe 20-item Mini-OAKHQOL has good psychometric properties and can be used for the measurement of quality of life in subjects with osteoarthritis of the lower limbs.     

Validity and internal consistency of a Hausa version of the Ibadan knee/hip osteoarthritis outcome measure

Background  

The Ibadan Knee/Hip Osteoarthritis Outcome Measure (IKHOAM) was developed for measuring end results of care in patients with knee or hip OA in Nigeria. The purpose of this study was to validate a Hausa translation of IKHOAM in order to promote its use among the Hausa populations of Nigeria and other West African countries.     

Development and reliability evaluation of an instrument to measure health-related quality of life in independent elderly

This study presents an instrument, the health-related quality of life (HRQOL) profile for independent elderly, to measure the health-related quality of life of the functionally independent elderly assisted in the outpatient setting, based on the adaptation of four validated scales: Short-Form Health Survey (SF-36), Duke-UNC Health Profile (DUHP), Sickness Impact Profile (SIP), and Nottingham Health Profile (NHP). The study also evaluates the instrument's reliability based on its use by two different observers with a 15-day interval. The instrument includes five dimensions (health perception, symptoms, physical function, psychological function, and social function) and 45 items. Reliability evaluation of the QUASI instrument was based on interviews with 142 elderly outpatients in the city of Rio de Janeiro, Brazil. Prevalence-adjusted kappa statistic was used to assess all 45 items. Correlation was also calculated between overall scores and scores on individual dimensions. In the reliability evaluation, 39 of the 45 items showed prevalence-adjusted kappa greater than 0.60.     

A new instrument to measure clinical outcomes

De Haan et al. have developed a new disability score (Amsterdam linear disability score; ALDS) based on item response theory. The advantages of the instrument are its generic applicability for multiple disease categories of varying severity and its linear scaling as a continuous variable, which facilitates interpretation and requires smaller sample sizes. Moreover, such a tool may very well be used as complementary outcome measure in a subset of patients participating in a mega-trial that concentrates on simple outcomes. A limitation is that users of the score still need to become familiar with its interpretation. It is not yet clear how many questions are needed to obtain a reliable estimate of the ALDS and therefore the time needed to complete the instrument is still uncertain.     

A new brief measure of oral quality of life

Introduction

We developed a brief measure of the impact of oral conditions on individual functioning and well-being, known as oral quality of life.

Methods

Among older male veterans (N = 827) and community dental patients (N = 113), we administered surveys consisting of extant oral quality of life items, using clinical dental data from the veteran samples. We assigned each oral quality of life item to a theoretical dimension, conducted an iterative series of multitrait scaling analyses to examine the item-fit with the dimensions, reduced the number of items, and examined the psychometric characteristics of new scales and their association with clinical indices.

Results

We developed two brief oral quality of life scales, one consisting of 12 items and the other of 6, the latter a subset of the former. Each demonstrated sound psychometric properties and was sensitive to clinical indices.

Conclusion

The two brief oral quality of life scales can be used to assess the population-based impact of oral conditions as well as outcomes of dental care.     

一种同时测量血小板聚集和分泌的新仪器

聚集和分泌是血小板的二个最重要的功能。本文介绍能同时连续测量聚集和分泌的带单片微机的新仪器。分泌是用光电倍增管通过测量荧光－荧光素酶系统的发光度实现的。测量聚集采用通常的比浊法。     

膝关节骨性关节炎患者生活质量及干预研究现状

摘要:膝关节骨性关节炎是一种以关节软骨变性,骨质增生为特点的骨关节疾病,其发病率和致残率均较高,严重影响患者的生活质量。经查阅国内外相关文献,并对文献进行整理、分析,本文阐述了膝关节骨性关节炎患者生活质量及干预研究现状,为进一步完善其相关研究提供依据。     

Questionnaires to measure sexual quality of life

Context: Sex is important to quality of life. There are a number of questionnaires to measure sexual-function, but many lack applicability and usefulness to certain groups. Objective: To identify questionnaires measuring sexual function, determine the domains most commonly assessed, and examine evidence for their usefulness in different populations. Data sources: Computerized literature search using Medline, PubMed and PsychLit, reference lists, and unpublished reports, published in English between 1957 and 2001. MESH terms included sexual function, sexual dysfunction, sexual satisfaction, quality of life, and questionnaire. Articles were excluded if the questionnaire did not measure sexual function from the patient perspective. Data extraction: Questionnaires were grouped as general questionnaires that include a sexual function domain, and sexual-function-specific questionnaires. Questionnaires were evaluated for domains, applicability to different populations, and evidence for reliability, validity and responsiveness. Data synthesis: Literature search yielded 62 questionnaires, 57 which assessed sexual function from the patient perspective; 12 were general and 45 specific. Six domains were commonly represented, including interest and desire, satisfaction/quality of experience, excitement/arousal, performance, attitude/behavior, and relationship. Only 28% could be used in homosexual patients, and 52% were applicable to both genders; 57% were designed for use in chronic disease populations. Only nine questionnaires had evidence for both adequate reliability and validity. Conclusions: Current measures of sexual functioning often exclude important domains, lack applicability to gender and sexual preference groups, or lack adequate testing of validity and testing in important populations. Future questionnaires should take into account these concerns.     

A new instrument for measuring anticoagulation-related quality of life: development and preliminary validation

Background  

Anticoagulation can reduce quality of life, and different models of anticoagulation management might have different impacts on satisfaction with this component of medical care. Yet, to our knowledge, there are no scales measuring quality of life and satisfaction with anticoagulation that can be generalized across different models of anticoagulation management. We describe the development and preliminary validation of such an instrument - the Duke Anticoagulation Satisfaction Scale (DASS).     

Health-related quality of life in patients with knee osteoarthritis attending two primary care clinics in Malaysia: a cross-sectional study

Objective

To ascertain the issues all general practice educators need to understand when educating GP registrars to learn about research.

Study Design

A review of MEDLINE [1996–2007], six websites and key informants produced 302 publications, which reduced to 35 articles, 7 books, and 9 policy documents.

Results

Key themes that emerged from a thematic analysis of the literature that GP educators need to consider when teaching registrars about research were [i] the need to understand that learning research is influenced by attitudes; [ii] the need to address organisational constraints on learning research; [iii] the need to identify the educational barriers on learning research; [iv] the need to understand there are gaps in GP research content – especially from GP registrars; And [v] the need to understand the value of research on the GP registrar's educational cycle of learning, which develops in a culture that allows research to flourish.

Conclusion

Australian GP registrars will observe a research culture only if they encounter clinician-researchers paid to practice and conduct research in their general practice.     

Willingness to pay per quality-adjusted life year in a study of knee osteoarthritis.

BACKGROUND: Determining whether a particular medical intervention is cost-effective requires that a threshold of cost per benefit gained be established. As debate continues over the appropriate threshold, we present measures of willingness to pay (WTP) per quality-adjusted life year (QALY) for own health and 2 hypothetical osteoarthritis scenarios. METHODS: One hundred ninety-three persons, located through random digit dialing in Harris County, Texas, completed face-to-face interviews collecting demographic information and health preferences using visual analog scale, time tradeoff, standard gamble, and WTP methodologies. RESULTS: The mean WTP/QALY for all methods was lower (range, $1221-$5690/QALY) than many estimates from revealed preference studies and lower than the oft-cited arbitrary cutoff of $50 000. WTP/QALY was highest when participants were judging their personal health improvements as opposed to hypothetical scenarios. There were some significant differences in WTP/QALY across elicitation methodologies for the same scenario. Demographic characteristics were not associated with WTP/QALY measures. CONCLUSIONS: The health states and improvements in health evaluated here do not contain a risk of mortality, unlike many situations in which WTP/QALY has been previously evaluated. The lower WTP/QALY values found here may indicate that the presence of a mortality risk reduction substantially increases stated WTP/QALY. Appropriate thresholds for cost-effectiveness may be dependent on the context of a situation, including risk of mortality.     

Primary osteoarthritis of hip, knee, and hand in relation to occupational exposure

Aim: To identify occupations with excess prevalence of osteoarthritis of the knee, hip, and hand in a nationwide survey and to compare occupations with and without excess prevalence with regard to biomechanical stresses and severity of osteoarthritis. Methods: Patients presenting with osteoarthritis of the knee, hip, or hand were recruited throughout France by their treating physician who collected information on history, including age at onset, occupation, and occupational stresses to joints. Severity was assessed using joint specific functional status questionnaires: Lequesne for the hip and knee and Dreiser for the hand. The distribution of osteoarthritis patients by occupation was compared with the distribution of occupations in all workers in France to obtain prevalence rate ratios. Results: Occupations with the greatest prevalence rate ratio were female cleaners (6.2; 95% CI 4.6 to 8.0), women in the clothing industry (5.0; 95% CI 3.9 to 6.3), male masons and other construction workers (2.9; 95% CI 2.6 to 3.3), and agriculture male and female workers (2.8; 95% CI 2.5 to 3.2). A twofold greater prevalence rate was observed within certain occupations between self-employed and salaried workers. Early onset of osteoarthritis was seen in the more heavy labour jobs with almost 40% of patients reporting their first symptoms before the age of 50. Conclusion: The early onset and severity of osteoarthritis in certain occupations warrants an urgent need for occupation specific studies for the development and evaluation of preventive strategies in this leading cause of disability in Western countries.     

Development and validation of a new health-related quality of life instrument for patients with sinusitis

Background and Objective: There are few validated measures of sinusitis-specific health-related quality of life (HRQL). This study used patient focus and pretesting groups followed by a prospective cohort study to develop and validate a HRQL instrument for patients with sinusitis. Methods: Instrument development involved a systematic literature review, use of expert input, and patient focus and pretesting groups. Patients were recruited from the practices of primary care providers and otolaryngologists. The derived survey instrument then underwent prospective testing in patients with acute sinusitis, chronic sinusitis, allergic rhinitis, and asymptomatic controls. Reduced item scales of the original instrument were developed for symptom frequency and bothersomeness. The psychometric properties of the survey instrument were evaluated for reliability, construct validity, responsiveness, and interpretability. Results: In the prospective study, 47 patients with acute sinusitis and 50 patients with chronic sinusitis were compared to 18 patients with allergic rhinitis and 60 patients without nasal symptoms. Forty-three (91.5) patients with acute sinusitis completed the questionnaire at baseline and at 1-month follow-up. Internal consistency was high for the symptom impact scale for acute and chronic sinusitis patients. The symptom frequency and especially bothersomeness scales had lower internal consistency particularly for acute sinusitis patients. Reproducibility among surgical patients retested prior to their procedure was good for each scale. A high degree of disciminant validity was demonstrated when comparing sinusitis patients to other groups, and a high degree of convergent validity was seen when the new measures were compared to other HRQL measures at baseline. Among patients with acute sinusitis, the responsiveness and interpretability of the symptom frequency, bothersomeness and impact scales were excellent. Conclusions: This study developed and validated a new sinusitis-specific HRQL instrument. The instrument included symptom frequency, bothersomeness and impact scales. It was shown to be valid in patients with acute and chronic sinusitis, and highly responsive and interpretable in acute sinusitis patients managed in the primary care setting.     

Development of a brief measure to assess quality of life in obesity

OBJECTIVE: Obesity researchers have a growing interest in measuring the impact of weight and weight reduction on quality of life. The Impact of Weight on Quality of Life questionnaire (IWQOL) was the first self-report instrument specifically developed to assess the effect of obesity on quality of life. Although the IWQOL has demonstrated excellent psychometric properties, its length (74 items) makes it somewhat cumbersome as an outcome measure in clinical research. This report describes the development of a 31-item version of the IWQOL (IWQOL-Lite). RESEARCH METHODS AND PROCEDURES: IWQOLs from 996 obese patients and controls were used to develop the IWQOL-Lite. Psychometric properties of the IWQOL-Lite were examined in a separate cross-validation sample of 991 patients and controls. RESULTS: Confirmatory factor analysis provided strong support for the adequacy of the scale structure. The five identified scales of the IWQOL-Lite (Physical Function, Self-Esteem, Sexual Life, Public Distress, and Work) and the total IWQOL-Lite score demonstrated excellent psychometric properties. The reliability of the IWQOL-Lite scales ranged from 0.90 to 0.94 and was 0.96 for the total score. Correlations between the IWQOL-Lite and collateral measures supported the construct validity of the IWQOL-Lite. Changes in IWQOL-Lite scales over time correlated significantly with changes in weight, supporting its sensitivity to change. Significant differences in IWQOL-Lite scale and total scores were found among groups differing in body mass index, supporting the utility of the IWQOL-Lite across the body mass index spectrum. DISCUSSION: The IWQOL-Lite appears to be a psychometrically sound and clinically sensitive brief measure of quality of life in obese persons.     

Metacognition: towards a new approach to quality of life

Purpose

Recent studies have demonstrated that various diseases states (e.g., schizophrenia, Alzheimer’s disease) and events (e.g., a stroke) alter a person’s perception of their physical and mental status. Most often this involves alterations in a person’s metacognitive capabilities, and this can question the conceptual model of quality of life (QoL) based on a “perspectivist” approach.

Methods

Using the example of schizophrenia, we applied a philosophical model, developed by Griffin, to deal with this potential threat to the validity of QoL assessment.

Results

Patients with schizophrenia are at risk for being impaired in their ability to assess their QoL. We hypothesise that metacognition (i.e., the ability to attribute mental states in terms of beliefs and goals to one’s self and others) is a formal condition to assess QoL. This particular skill is important because self-reflection is necessary for making a qualitative judgment. A link between this psychological concept and the philosophical concept of reflexivity may be established. We propose a conceptual approach to QoL that takes into account the patient’s reflexivity. This approach is derived from Griffin’s theory based on the list of “prudential values” and the satisfaction of the informed desires of the individual.

Conclusion

The ability of patients to evaluate and value their life should be considered to enrich the concept of QoL. The approach derived from Griffin’s theory might constitute a new avenue for QoL research.