Predictors of decline in self-reported health: addressing non-ignorable dropout in longitudinal studies of ageing
(English)Manuscript (preprint) (Other academic)
Predictors of decline in health in older populations have been investigated in multiple studies before. Most longitudinal studies of ageing, however, assume that dropout at follow-up is ignorable (missing at random) given a set of observed characteristics at baseline. The objective of this study was to address non-ignorable dropout in investigating predictors of declining self-reported health in an older population (50 years or older) in Sweden, the Netherlands, and Italy. We used the SHARE panel survey, and since only 2893 out of the original 5653 participants in the survey 2004 were followed-up in 2013, we studied whether the results were sensitive to the high dropout rate. When taking dropout into account, we found that age and a greater number of chronic diseases were positively associated with a decline in self-reported health in the three countries studies here. Maximum grip strength was associated with decline in self-reported health in Sweden and Italy, and higher body mass index and self-reported limitations in normal activities due to health problems was associated with decline in self-reported health in Sweden. The findings, although not surprising, contribute to the literature in understanding the robustness of longitudinal study results to non-ignorable dropout while considering three different populations in Europe.
Longitudinal studies, Dropout, Sensitivity analysis, Chronic disease, SHARE
Probability Theory and Statistics
Research subject Statistics
IdentifiersURN: urn:nbn:se:umu:diva-127118OAI: oai:DiVA.org:umu-127118DiVA: diva2:1043962
FunderForte, Swedish Research Council for Health, Working Life and Welfare, 2013-2506