| Titre : | Characteristics of non-responders and the impact of non-response on prevalence estimates of dementia. (1997) |
| Auteurs : | F. BOERSMA ; J.A. EEFSTING ; W. VAN DEN BRINK ; W. VAN TILBURG |
| Type de document : | Article |
| Dans : | International journal of epidemiology (vol. 26, n° 5, 1997) |
| Pagination : | 1055-1062 |
| Langues: | Anglais |
| Mots-clés : | Démence Alzheimer ; Evaluation ; Facteur socioéconomique ; Age ; Sexe ; Etat matrimonial ; Epidémiologie ; Prévalence ; Méthodologie ; Biais ; Grand âge ; Homme ; Europe ; Etude comparée ; Système nerveux [pathologie] ; Pays Bas |
| Résumé : | [BDSP. Notice produite par INIST oIR0xE1T. Diffusion soumise à autorisation]. Background. Differential distributions of sociodemographic characteristics and cognitive impairment in responders and non-responders may result in a biased prevalence estimate of dementia based on responders only. Methods. Responders (n=2191) to a cross-sectional, two-stage community study were compared with regard to sociodemographic characteristics and cognition with three subgroups of non-responders : (A) subjects who refused to participate (n=369), (B) subjects who were too ill or who had died prior to the screening (n=72) and (C) subjects who had moved out of the study region or were not traceable (n=23). Prevalence estimates specific for age and housing situation in responders and physicians'ratings of cognitive impairment were used to estimate the prevalence of dementia among non-responders. Results. Group A differed from responders in age and housing situation, group B in age, housing and cognition, and group C only in age. Separate prevalence estimates of dementia based on age, housing and cognition yielded figures for group A between 4.9% and 7.2%, for group B between 13.1% and 19.1%, and for group C between 2.6% and 4.2%. Joined with the prevalence rate among responders (6.5%) the best possible point estimate of the prevalence of dementia in the target population lies between 6.4% and 6.9%, i.e. within the 95% confidence interval (Cl) of the prevalence among responders (5.4-7.5%). (...) |
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