Empowerment beliefs and intention to uptake cervical cancer screening: three psychosocial mediating mechanisms

Three studies tested if the associations between women's empowerment beliefs and intentions to attend cervical cancer screening could be explained by mediating psychological mechanisms: control-related beliefs, well being-related beliefs, and beliefs and evaluations referring to social functioning. Data were collected from January to March 2011 in the rural and urban areas across regions of Poland. Study 1 (N = 386) indicated that women with strong empowerment harbored stronger self-efficacy and beliefs that screening participation would make them feel in control of their own health and body. These two types of cognitions were, in turn, associated with stronger cervical cancer screening intentions. Results of Study 2 (N = 527) confirmed three significant well being-related mediators in the relationship between empowerment beliefs and cervical cancer screening: perceived benefits of screening related to well being, appearance satisfaction, discomfort- and shame-related barriers for screening. Finally, Study 3 (N = 424) showed that empowerment enabled receiving higher social support for cervical cancer screening, promoted perceiving fewer barriers for cervical cancer screening-related communication and more social benefits of engaging in cervical cancer screening. Support for cervical cancer screening, social barriers, and benefits were, in turn, related to screening intentions. Across the studies similar shares of intention variance were explained, and thus the hypothesized mediating mechanisms may have similar explanatory power.     

Empowerment Beliefs and Intention to Uptake Cervical Cancer Screening: Three Psychosocial Mediating Mechanisms

Three studies tested if the associations between women's empowerment beliefs and intentions to attend cervical cancer screening could be explained by mediating psychological mechanisms: control-related beliefs, well being-related beliefs, and beliefs and evaluations referring to social functioning. Data were collected from January to March 2011 in the rural and urban areas across regions of Poland. Study 1 (N = 386) indicated that women with strong empowerment harbored stronger self-efficacy and beliefs that screening participation would make them feel in control of their own health and body. These two types of cognitions were, in turn, associated with stronger cervical cancer screening intentions. Results of Study 2 (N = 527) confirmed three significant well being-related mediators in the relationship between empowerment beliefs and cervical cancer screening: perceived benefits of screening related to well being, appearance satisfaction, discomfort- and shame-related barriers for screening. Finally, Study 3 (N = 424) showed that empowerment enabled receiving higher social support for cervical cancer screening, promoted perceiving fewer barriers for cervical cancer screening-related communication and more social benefits of engaging in cervical cancer screening. Support for cervical cancer screening, social barriers, and benefits were, in turn, related to screening intentions. Across the studies similar shares of intention variance were explained, and thus the hypothesized mediating mechanisms may have similar explanatory power.     

Repeated Pap smear screening among Mexican-American women

The factors that influence repeated cervical cancer screening among Latina women are not well understood. Studies of compliance in this population over-emphasize initial or recent screening and under-emphasize how this practice is repeated over time. The purpose of this study was to identify the demographic and psychosocial factors associated with repeated Pap smear screening among low-income Mexican-American women living in two urban communities in Texas. A total of 1804 Mexican-American women were interviewed as part of a community survey. Multiple regression results indicate that demographic characteristics such as age, marital status, level of acculturation and health insurance were associated with the total number of Pap smears reported for the 5 years prior to the interview. Pap smear beliefs were the strongest predictor of repeated screening, while global beliefs about cancer did not significantly explain the results. Health promotion interventions should take into consideration the cultural and psychosocial needs of Mexican-American women, placing emphasis on their specific screening-related beliefs, if they are to succeed in promoting repeated compliance with Pap smear screening guidelines.     

Disparities in Receipt of Breast and Cervical Cancer Screening for Rural Women Age 18 to 64 with Disabilities

BackgroundPrevious research has found breast and cervical cancer screening disparities between women with and without disabilities, and between women living in rural versus urban areas. Living in a rural area may add to the barriers women with disabilities experience when attempting to obtain screening for breast and cervical cancer. The purpose of this study was to examine the combination of disability status and rurality in association with receipt of breast and cervical cancer screening among women age 18 to 64 in the United States.MethodsWe conducted cross-sectional analyses of data from the Medical Expenditure Panel Survey, using pooled annual data files from 2002 through 2008. We compared recent receipt of breast and cervical cancer screening among four groups: 1) urban women without disabilities, 2) urban women with disabilities, 3) rural women without disabilities, and 4) rural women with disabilities.FindingsOverall, women with disabilities were less likely to be up to date with mammograms and Pap tests compared with women with no disabilities. Similarly, women in rural areas were less likely to have received breast or cervical cancer screening within recommended timeframes. Women who both had a disability and lived in a rural area were the least likely to be current with screening.ConclusionsOur findings suggest that living in rural regions compounds disparities in receipt of cancer screening among women with disabilities. Increased attention is needed to improve receipt of cancer screening among rural women with disabilities.     

Cervical cancer screening beliefs among young Hispanic women

OBJECTIVES: This study examined beliefs, attitudes, and personal characteristics that correlated with self-reported cervical cancer screening history among Hispanic women aged 18 to 25 years old in El Paso, TX, a large metropolitan area on the U.S.-Mexico border. METHODS: Data were collected through a cross-sectional, face-to-face survey. The study questionnaire was based primarily on the Health Belief Model, and included scales that measured perceived susceptibility and seriousness of cervical cancer, and perceived benefits and barriers to Pap test screening. The study questionnaire also included measures of acculturation, Pap test history, pregnancy and sexual history, use of birth control, type of medical insurance, and educational attainment. RESULTS: Sixty-nine percent reported ever having had a Pap test and 56% reported having had a test in the past year. Eighty percent reported that they were sexually active, and of these, 63% reported using birth control. Respondents understood the seriousness of cervical cancer, their susceptibility to cervical cancer, and the benefits of Pap testing; however, only 61% agreed that most young women whom they know have Pap tests. Greater acculturation and the belief that most young unmarried women have Pap tests were positively associated with ever having screening. The perception that the test would be painful and not knowing where to go for the test were negatively associated with ever having a Pap test. CONCLUSIONS: This study found suboptimal rates of screening for cervical cancer in a sample of young Hispanic women residing along the U.S.-Mexico border. Although women may understand the seriousness of cervical cancer and the benefits of screening, perceptions about Pap tests may pose barriers to undergoing screening. Efforts to increase screening also may need to focus specifically on women who are least acculturated, as they also were least likely to have had prior Pap tests.     

Correlates of Cervical Cancer Screening Adherence Among Women in the U.S.: Findings from HINTS 2013–2014

Following the latest update of cervical cancer screening guidelines in 2012, we estimate the prevalence of guideline adherent cervical cancer screening and examine its associated factors among a nationally representative sample of US women aged 21–65 years. Our study was based on cross-sectional data from Cycles 3 (2013) and 4 (2014) of the Health Information National Trends Survey. The final analytic sample consisted of 2822 women. Guideline adherent cervical cancer screening was defined as having a Pap test within the last 3 years. Correlates of guideline adherent cervical cancer screening included socio-demographic and health-related characteristics and HPV/cervical cancer-related beliefs and knowledge items. Multivariable logistic regression analyses were used to estimate prevalence of guideline adherent screening. An estimated 81.3% of women aged 21–65 years reported being screened for cervical cancer within the last 3 years. Controlling for sociodemographic and health-related characteristics and survey year, women aged 46–65 years were less likely to be guideline adherent than those aged 21–30 years (aPR?=?0.89; 95% CI 0.82–0.97). The adjusted prevalence of adherence was significantly higher among married/partnered than among not married women (aPR?=?1.13; 95% CI 1.05–1.22), and those with one to three medical visits (aPR?=?1.30; 95% CI 1.14–1.48), and four or more visits in the past year (aPR?=?1.26; 95% CI 1.09–1.45) compared to those with no medical visits. Differences in unadjusted prevalence of guideline adherent screening depending on women’s beliefs and knowledge about HPV and cervical cancer were not significant in adjusted analyses. Lack of interaction with a healthcare provider, being not married/partnered and increasing age continue to be risk factors of foregoing guideline adherent cervical cancer screening.     

A qualitative analysis of South African women's knowledge, attitudes, and beliefs about HPV and cervical cancer prevention, vaccine awareness and acceptance, and maternal-child communication about sexual health

In South Africa, cervical cancer is the second leading cause of death among women. Black South Africa women are disproportionately affected by cervical cancer and have one of the highest mortality rates from this disease. Although the body of literature that examines HPV and cervical cancer prevention is growing in the developing world; there is still a need for a better understanding of women's knowledge and beliefs around HPV and cervical cancer prevention. Therefore, this formative study sought to examine women's attitudes, beliefs and knowledge of HPV and cervical cancer, HPV vaccine acceptance, maternal-child communication about sexuality, and healthcare decision-making and gender roles within an urban community in South Africa.Women ages 18-44 were recruited from an antenatal clinic in a Black township outside of Johannesburg during the fall of 2008. Twenty-four women participated in three focus groups. Findings indicated that the women talked to their children about a variety of sexual health issues; had limited knowledge about HPV, cervical cancer, and the HPV vaccine. Women were interested in learning more about the vaccine although they had reservations about the long-term affect; they reinforced that grandmothers played a key role in a mother's decisions’ about her child's health, and supported the idea that government should provide the HPV vaccine as part of the country's immunization program.Our findings indicate the need to develop primary prevention strategies and materials that will provide women with basic cervical cancer prevention messages, including information about HPV, cervical cancer, the HPV vaccine, screening, and how to talk to their children about these topics. Prevention strategies should also consider the cultural context and the role that grandmothers play in the family unit.     

城市女性宫颈癌机会性筛查接受障碍原因及影响因素

目的 分析城市女性宫颈癌机会性筛查接受障碍原因及影响因素,提出促进女性宫颈癌筛查的策略与建议。方法 对2009年1月-2015年3月随机抽取的重庆市内8家医院就诊的女性进行宫颈癌筛查接受意愿问卷调查。结果 有效问卷11 965（98.9%）份,16.77%受访者不愿意接受宫颈癌机会性筛查,接受障碍前3位原因为"认为没有必要,相信自己没有问题"占44.44%,"不愿意或害怕妇科检查"占30.39%,"不知道筛查的意义"占10.71%。多因素logistic回归分析结果显示,年龄越小,文化程度越低越不愿意接受筛查;无业、未生育和生产次数≥ 3者,没有听说过宫颈癌、不知道宫颈癌筛查目的者均不愿意接受筛查。结论 缺乏健康意识为筛查接受障碍的主要原因,建议增强宫颈癌筛查相关知识传播及认知,重点在青年女性、低学历、无业及未生育者、不了解宫颈癌及筛查者。     

An examination of sociocultural factors associated with cervical cancer screening among low-income Latina immigrants of reproductive age

The purpose of this study was threefold: 1) to examine whether low-income Latina immigrants were less likely to receive a Pap smear than low-income non-Latinas; 2) to examine ethnic differences regarding cervical cancer knowledge; and 3) to examine the sociocultural factors associated with cervical cancer screening among low-income Latina immigrants. Participants included 225 low-income women of reproductive age attending a WIC (Women, Infants, and Children) clinic (50% Latina immigrants and 50% non-Latinas). Latina immigrants were less educated, less likely to have health insurance, and more likely to be married or living with a partner than non-Latinas (ps < 0.05). All non-Latinas had a Pap smear in the past compared to 81.3% of Latina immigrants (p < 0.001). Latina immigrants displayed significantly less knowledge regarding cervical cancer than non-Latinas (ps < 0.01). Latina immigrants tended to display culturally based knowledge and beliefs regarding cervical cancer and screening that may influence getting a Pap smear.     

Clinical and demographic predictors of late-stage cervical cancer

BACKGROUND: Despite increasingly widespread use of the Papanicolaou smear, almost half of all women with invasive cervical cancer are diagnosed at a late stage (regional or distant). Little is known about factors associated with late-stage diagnosis of cervical cancer. OBJECTIVE: To examine the relationship of age, race, education level, income level, smoking, marital status, health insurance type, comorbidity, and residence in an urban or rural setting to late stage at diagnosis of cervical cancer. METHODS: Incident cases of invasive cervical cancer occurring in 1994 in Florida were identified from the state tumor registry (N = 852). Cases were linked with state discharge abstracts and the 1990 US census. Multiple logistic regression was used to determine the relationship between predictor variables (age, race or ethnicity, marital status, smoking status, education level, income level, insurance type, comorbidity, and urban vs rural residence) and the odds of late-stage diagnosis. RESULTS: Age, marital status, and insurance type were associated with late-stage diagnosis. Each additional year of age was associated with a 3% increased odds of late-stage diagnosis (odds ratio [OR], 1.03; 95% confidence interval [CI], 1.02-1.05; P<.001). Being unmarried was associated with a 63% increased odds of late-stage diagnosis (OR, 1.63; 95% CI, 1.18-2.25; P=.003). Being uninsured was associated with a 60% increased odds of late-stage diagnosis (OR, 1.60; 95% CI, 1.07-2.38; P=.02). Having commercial health maintenance organization insurance was associated with a 46% decreased odds of late-stage disease (OR, 0.54; 95% CI, 0.30-0.96; P=.04). Race, education level, income level, smoking status, comorbidity, and urban residence were not associated with stage at diagnosis. CONCLUSIONS: Women with cervical cancer who are elderly, unmarried, and uninsured are more likely to be diagnosed at a late stage. These women should be targeted for cervical cancer education and screening programs.     

Knowledge about Cervical Cancer Risk Factors,Traditional Health Beliefs,and Pap Testing Among Vietnamese American Women

Introduction: The objective of this paper was to examine knowledge about cervical cancer risk factors and traditional health beliefs in relation to Papanicolaou (Pap) testing among Vietnamese women. Methods: A population-based survey was conducted in Seattle (n<352, response rate=82%) during 2002. Results: The proportions of women who knew that older age, not getting regular Pap tests, and Vietnamese ethnicity are associated with an elevated cervical cancer risk were only 53%, 62%, and 23%, respectively. The majority (87%) incorrectly believed poor women’s hygiene is a risk factor for cervical cancer. Approximately two-thirds (68%) of the women had received a Pap test during the preceding three years. Knowing that lack of Pap testing increases the risk of cervical cancer was strongly associated (p<0.001) with recent Pap smear receipt. Conclusion: Our results confirm that Vietnamese women have lower levels of cervical cancer screening than non-Latina white women. Intervention programs addressing Pap testing in Vietnamese communities should recognize women’s traditional beliefs while encouraging them to adopt biomedical preventive measures into their daily lives.     

Integrating cervical cancer prevention initiatives with HIV care in resource-constrained settings: A formative study in Durban,South Africa

Cervical cancer screening rates remain suboptimal among women in South Africa (SA), where cervical cancer prevalence is high. The rollout of HIV-related services across SA may provide a means to deliver cervical cancer screening to populations with limited access to health care systems. In this mixed methods study, psychosocial factors influencing cervical cancer prevention and perceptions of the provision of Pap smears in HIV care settings were examined. Structured interviews were conducted with women (n = 67) from a municipal housing estate in Durban, SA. Key informants (n = 12) also participated in semi-structured interviews. Findings revealed that participants had low cervical cancer knowledge, but desired more information. Relevant themes included the normalisation of HIV and beliefs that cervical cancer might be worse than HIV. A comprehensive community clinic was desired by most, even if HIV-positive patients were treated there. This study provides important insight into integrating cervical cancer screening with HIV clinics, which may increase cancer screening among South African women.     

Exploration of factors linked with high cervical cancer rates in women from the former Yugoslavia in Victoria,Australia

Objectives: The aim of the project was to identify the cervical screening rate and other factors that may be associated with high rates of cervical cancer in women from the former Yugoslavia compared to the general population in Victoria, Australia. Design: A cross-sectional survey was conducted by structured personal interviews of 42 Bosnian, 56 Croatian, 49 Macedonian, and 35 Serbian women, and 39 women who identified as Yugoslav or of mixed background. Self-report data were collected on Pap testing behaviour, estimated screening rate of each community, stage-based barriers to cervical screening, and women's theories about causes of cervical cancer within their community. Results: Women in this study had an acceptable screening rate, but barriers to cervical screening were similar to those of other groups. While Macedonian women believed more of their community had Pap tests than the other cultural groups, just under half were under-screened themselves. Smoking rates were very high for women in this study. The most common causes of cervical cancer suggested by women in the study were: a low screening rate, lifestyle stress, and chemicals. Conclusion: It is unlikely that the high cervical cancer rate in women from the former Yugoslavia is a result of under-screening, lifestyle stress, or chemicals. Smoking may well contribute to the cancer rate, however the most likely explanation is that cancers not previously detected in Yugoslavia are now being found, together with cervical abnormalities, within the systematic two yearly screening programme of PapScreen Victoria, in Australia.     

Cervical Cancer Risk as a Predictor of Pap Smear Use in Rural North Carolina

Risk for invasive cervical cancer is reported to be higher in rural areas than urban ones, and cervical cancer-related mortality is higher in rural women due to poorer utilization of preventive services and subsequent presentation at late stages of the disease. This cross-sectional study examined the relationship between prevalence of risk factors for cervical cancer and the degree of compliance with risk-appropriate screening guidelines for cervical cancer. Secondary data were analyzed for 614 women from Robeson County, NC, aged 40 and older, and of mainly rural and low socioeconomic status. High-risk status was determined by the presence of any of the following five risk factors: a history of more than two sexual partners, age at first sexual intercourse under 18 years, history of sexually transmitted disease, history of sexually transmitted disease in sexual partner(s), and smoking. Low-risk status was the absence of all factors. A high-risk participant was considered compliant if she had had at least three Pap smears in the 3 years prior to the interview, while a low-risk participant was considered compliant if she had had at least one Pap smear within the previous 3 years. Overall, 82% of the participants were at high risk for cervical cancer. However, only 41% of all participants were compliant with the risk-appropriate screening guidelines. Low-risk status was significantly associated with compliance with cervical cancer screening guidelines (adjusted OR = 6.7; 95% CI = 3.7 to 11.1, p = .0001). Findings in this study population suggest rural women at high risk for cervical cancer are less likely to be compliant with appropriate Pap smear screening guidelines, indicating the need to target educational programs.     

Breast and cervical cancer screening and health beliefs among African American women attending educational programs

This article assessed the relationship between breast and cervical cancer screening rates and health beliefs in African American women participating in Witness Project of Harlem (WPH) education sessions. WPH is a culturally sensitive, faith-based breast and cervical cancer screening education program targeting African American women in medically underserved New York City communities. A questionnaire administered to women participating for the first time in a Witness Project education session collected demographics, adherence to breast and cervical cancer screening, and information about health beliefs related to cancer worry, medical mistrust, and religious faith. Screening adherence guidelines applied were as per the American Cancer Society recommendations. No statistically significant relationship was found between worry about getting breast or cervical cancer and screening adherence, or between screening adherence and agreement with statements about medical mistrust and religious beliefs. The low screening mammography and monthly breast self-exam rates emphasize the utility of programs like WPH that teach the importance of screening mammography and breast self-exam and point to the need for increased access to quality health care and cancer screening in underserved populations.     

Exploring the knowledge, attitudes, beliefs, and communication preferences of the general public regarding HPV: findings from CDC focus group research and implications for practice.

Genital human papillomavirus (HPV) infection is the most common sexually transmitted virus in the United States, causing genital warts, cervical cell abnormalities, and cervical cancer in women. To inform HPV education efforts, 35 focus groups were conducted with members of the general public, stratified by gender, race/ethnicity, and urban/rural location. Focus groups explored participants' knowledge, attitudes, and beliefs about HPV and a hypothetical HPV vaccine as well as their communication preferences for HPV-related educational messages. Audience awareness and knowledge of HPV were low across all groups. This, along with an apparent STD-associated stigma, served as barriers to participants' hypothetical acceptance of a future vaccine. Although information about HPV's high prevalence and link to cervical cancer motivated participants to learn more about HPV, it also produced audience fear and anxiety. This research suggests that HPV- and HPV-vaccine-related education efforts must be approached with extreme caution. Other practical implications are discussed.     

A profile of Australian women practicing breast self-examination.

Breast self-examination (BSE) and medical breast examination practices were studied in a group of 1,103 women without diagnosed breast cancer, randomly sampled to conform in age and social status with breast cancer cases from the population of Brisbane, Australia between 1981 and 1985. Relationships between these practices and sociodemographic factors, breast cancer risk indicators, health related behaviors and source of knowledge about BSE were analyzed. Overall, 63% of women reported performing BSE. BSE was practiced frequently (monthly or more). BSE frequency was only weakly associated with breast cancer risk indicators. It was more strongly linked with age, the 20-44 year group being more likely to examine their breasts occasionally and the women 65 years and over being less likely to examine their breasts. Married women were the most likely to practice BSE frequently and widowed or single women most likely never to practice. Women who underwent cervical smear testing were more likely to perform BSE than those who did not have smear tests. Women who learned BSE from their doctors as opposed to other sources practiced BSE more frequently and were more likely to practice BSE exactly as taught.     

Correlates of cervical cancer screening among underserved Hispanic and African-American women

BACKGROUND: Substantial subgroups of American women, specifically those of ethnic minorities, have not been screened for cervical cancer or are not screened at regular intervals. The rates for receipt of female-related cancer screening tests remain far below the goals set forth in Healthy People 2010. OBJECTIVE: This study applied a well-known, recently revised theoretical model of health care access and utilization, the Behavioral Model for Vulnerable Populations, to examine the correlates of the adherence to cervical cancer screening guidelines among publicly housed Hispanic and African-American women, two of the most vulnerable segments of our population. METHODS: This study conducted a cross-sectional survey of a community-based random sample of 230 African-American and Latino female heads of household, from a geographically defined area, the three urban public housing communities in Los Angeles County, CA. RESULTS: Only 62% of our sample had received a screening for cervical cancer within the past year. Yet, 29% of the sample claimed that no health care provider had ever told them that they needed a screening test for cervical cancer. Hispanic and older women are by far less likely to adhere to screening guidelines; in this study, 51% of Hispanics and 22% of African-Americans reported no screening within the last year. Multivariate analysis shows that affordability, continuity of care, and receiving advice from health care providers regarding a Papanicolaou (Pap) smear were significant predictors of up-to-date to cervical cancer screening. CONCLUSION: This study documents a significant disparity in screening for cervical cancer among underserved minorities, particularly Hispanic, uninsured, and older women. The continuity of obtaining medical services and receiving recommendations from physicians remain the core factors that are significantly associated with obtaining cervical cancer screening. These results underscore the need for continued efforts to ensure that medically underserved minority women have access to cancer screening services.     

Beliefs about cervical cancer and human papillomavirus (HPV) and acceptability of HPV vaccination among Chinese women in Hong Kong

OBJECTIVE: To assess the knowledge and beliefs on cervical cancer and HPV infection and to evaluate the acceptability of HPV vaccination among Chinese women. METHODS: Seven focus groups were conducted with ethnic Chinese women aged 18-25 (n=20), 26-35 (n=13), and 36 and above (n=16) in a community women's health clinic in Hong Kong in 2006. The discussions were audio taped, transcribed and analyzed. Recurrent themes related to cervical cancer, HPV infection and vaccination were highlighted. RESULTS: Diverse conceptions on likely causes of cervical cancer were noted, covering biological, psychological, environmental, lifestyle and sexual factors. Most women had not heard of HPV and its mode of transmission. The participants had difficulties understanding and accepting the linkage between cervical cancer and the sexually transmitted HPV infection. HPV infection was seen as personally stigmatizing with significant adverse impact on self-esteem and significant relationships. Participants favored HPV vaccination both for themselves and their teenage daughters if authoritative endorsement was provided. CONCLUSION: Inadequate knowledge and misconceptions on cervical cancer and HPV were common. Most participants welcomed and favored having HPV vaccination. Apart from promoting HPV vaccination, cervical cancer prevention should also include strategies to promote knowledge and minimize the stigmatizing effect of a sexually transmitted HPV infection.     

Influence of Health Care, Cost, and Culture on Breast Cancer Screening: Issues Facing Urban American Indian Women

Background. Breast cancer is the second leading cause of cancer death among American Indian women. Southwestern American Indian women are more likely to have distant spread of the disease, and 5-year survival from breast cancer is poor in comparison to U.S. whites. Mortality from breast cancer could be reduced by more than 30% in American Indian women if current recommendations for screening were followed.Methods. A random household cross-sectional survey was conducted among 519 adult American Indian women in Phoenix, Arizona. Logistic regression was used to identify predictors of recent clinical breast examination and mammogram among those women aged 40 years and older.Results. Just more than half (53.0%) of the women surveyed reported they had received a clinical breast examination in the last year, and 35.7% indicated they had received a mammogram in the last 2 years. Access to care, knowledge of the examinations, and health beliefs were positively associated with breast cancer screening in the multivariate analyses.Conclusions. The cancer screening rates observed in urban American Indian women are far below current national estimates and Healthy People 2000 Objectives. This study confirms the limited access of urban Indians to preventive health services, and supports a role for cancer education in improving screening participation in this special population.