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Abstract #12257 Published in IGR 7-2
A comparison of participants and non-participants in the Chennai Glaucoma Study-rural population
Paul PP; George RJ; Arvind H; Raj M; Augustian; Ramesh SV; Sriram P; Kumaramanickavel G; McCarthy C; Vijaya LOphthalmic Epidemiology 2005; 12: 125-135
PURPOSE: To study whether the difference in the demographic characteristics of participants and non participants could result in biased prevalence estimates and associations. AIM: To compare the non-participant and participant characteristics, and to ascertain if non-response bias is present in the rural population of the Chennai Glaucoma Study (CGS). METHODS: Rural participants and non-participants were compared with regard to socio-demographic variables (age, gender, religion, mother tongue, literacy and employment). RESULTS: 4800 subjects aged 40 years or over were enumerated, 82% (3934: 45% male and 55% female) responded. Gender did not influence participation (adjusted OR-1.11, CI: .91-1.36). Subjects in the 70-79 year age group were more likely to respond (OR-1.76; CI-1.31-2.38). Hindus had a higher participation rate than Christians or Muslims (adjusted OR-2.63, CI: 1.80-3.84). The other predictors of participation were illiteracy (adjusted OR-1.44, CI: 1.22-1.70), unemployment (OR-1.28, CI: 1.04-1.58), place of residence (main villages) (OR-6.66, 95% CI: 4.6-9.64). CONCLUSION: Based on our study findings, it does not seem likely that participation bias will affect the study results.
Dr. PP Paul, Glaucoma Projectm, Vision Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, India
Classification:
1.1 Epidemiology (Part of: 1 General aspects)
