Determinants of cognitive impairment over time among the elderly in Taiwan: results of the national longitudinal study.

This study aimed to identify the risk factors for cognitive impairment among the elderly population in Taiwan. Data were drawn from three waves of the "Survey of Health and Living Status of the Elderly in Taiwan", a national longitudinal study started in 1989. We included respondents without dementia or cognitive impairment at baseline in 1993 and followed them over a 10-year period.