Alzheimer's Disease Genes Are Associated with Measures of Cognitive Ageing in the Lothian Birth Cohorts of 1921 and 1936

Table 1

Details of the Lothian Birth Cohorts of 1921 and 1936.

	LBC1921	LBC1936
Total	505	998
Females (%)	296 (58.7)	494 (49.5)
Males (%)	209 (41.3)	504 (50.5)
Mean age in years^1 (± s.d)	10.9 ± 0.28	10.9 ± 0.28
Mean age in years^2 (± s.d)	79.11 ± 0.57	69.58 ± 0.83
≥1 APOE ε4 allele	135	287
no APOE ε4 allele	370	672

¹Mean age at original test date, ²Mean age when revisited.