Table 1. Descriptive characteristics for all samples.

	AD+P	AD int P	AD−P
n	496	639	156
% Female	66.9	60.9	59
Age at onset, mean (s.d.)	73.1 (6.2)	72.4 (6.8)	73.4 (6.3)
Age at interview/ascertainment, mean (s.d.)	76.9 (5.8)	73.3 (7.3)	76.4 (5.8)

Abbreviations: AD, Alzheimer's disease; Int, intermediate; P, psychosis.