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Standardised prevalence ratios for cognitive impairment. Estimates are prevalence ratios compared to the unexposed group, directly standardised by age and gender. Point estimates and 95% confidence intervals are shown. Exposure groups are broadly defined (classified as exposed by at least one ascertainment method). Panels show (a) reasoning; (b) reaction time; (c) numeric memory; (d) pairs matching; (e) prospective memory.
