Several factors influenced attrition in a population-based elderly cohort: Neurological disorders in Central Spain Study

Saturio Vega, Julián Benito-León, Félix Bermejo-Pareja, María José Medrano, Luisa M. Vega-Valderrama, Cilia Rodríguez, Elan D. Louis

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

Objective: We studied attrition (i.e., participant dropout) 3 years after the baseline interview in a population-based Spanish cohort. Study Design and Setting: The Neurological Disorders in Central Spain study is a longitudinal, population-based survey of chronic neurologic conditions in persons aged ≥65 years. Multivariate logistic regression analysis was used to examine baseline differences between participants who took part in the 3-year follow-up evaluation vs. those who did not. Results: Of the 5,278 participants evaluated at baseline (1994-1995), 1,482 (28.1%) were lost to the follow-up (1997-1998). Factors that were associated with dropout due to refusal were as follows: living in a rural area and being single. Contact failure was associated with older age and being unmarried and widowed. Unreachable participants were less likely to take three or more medications or live in a professional neighborhood. Predictors of dropout due to death were male gender, older age, having impaired activities of daily living, taking more medications, poor self-perceived health, dementia, and smoking. Conclusions: These findings on participants who are at high risk of dropout may be useful in the planning phase of future prospective studies. Of the possible reasons for attrition, refusal is the most important because it is amenable to change. Crown

Original languageEnglish (US)
Pages (from-to)215-222
Number of pages8
JournalJournal of Clinical Epidemiology
Volume63
Issue number2
DOIs
StatePublished - Feb 1 2010
Externally publishedYes

Keywords

  • Attrition
  • Cohort maintenance
  • Cohort study
  • Elderly
  • Follow-up study
  • Population-based study

ASJC Scopus subject areas

  • Epidemiology

Fingerprint Dive into the research topics of 'Several factors influenced attrition in a population-based elderly cohort: Neurological disorders in Central Spain Study'. Together they form a unique fingerprint.

  • Cite this