A comparison of participants and non-participants in a serum sample survey in Texas City, Texas.

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Title: A comparison of participants and non-participants in a serum sample survey in Texas City, Texas.
Author: Carlos H. Martinez
Abstract: Lack of participation and response can affect the validity and generalizability of epidemiologic surveys . Participation has decreased in recent decades , and thus there is a need to determine reasons for and implications of this change . Usually respondents have better health , habits , and socioeconomic status and are interested in their health , being described as a “worried healthy” group . It is unclear if this explanation applies to minorities . The Environmental Risk , Coping , and Hispanic Health Project of the Center for Population Health and Health Disparities of UTMB , a population -based survey conducted in Texas City , Texas , included an interview of the randomly selected participants and an invitation to donate blood for biological measures . The study represented an opportunity to compare the characteristics of participants in the initial survey who , subsequently , provided blood sample and those who declined . In this Capstone the hypothesis that disadvantaged and less healthy groups are less likely to participate in serum sample collection as part of a sero -epidemiologic study was tested . The specific aims included : to determine the percentage of respondents declining to donate blood ; to compare the characteristics of those who donated blood and those who declined , for the whole sample and across ethnic groups ; and to examine the association with stress . We found that participation was lower than in similar surveys , with different response rates by ethnicity . We did not find great differences between respondents and nonrespondents , other than age , smoking habit , and perceived poor health . The only factors that were maintained in a multivariate analysis were age , family income , and smoking habit . We also found interaction between age and ethnicity , with advanced age being related to less likelihood of nonresponse in all ethnicities except in Non -Hispanic Blacks , where the direction was the opposite . A comparison of respondents and nonrespondents across ethnicities showed no additional factors , with the exception of results within US -born Hispanics . In addition to age , being a smoker and reporting poor health were associated with nonresponse , while low income was associated with less likelihood of being nonrespondent . For all participants and across ethnicities perceived stress did not have an association with response
URI: http : / /hdl .handle .net /2152 .3 /154
Date: 2008-05-20


A comparison of participants and non-participants in a serum sample survey in Texas City, Texas.. The University of Texas Medical Branch. Available electronically from http : / /hdl .handle .net /2152 .3 /154 .

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