Table 1.

Descriptive statistics for age and FI in ELSA and LBC1936 (raw scores), alongside Pairwise correlations of the FI across Wave 1, 3 and 5 in LBC1936

	N	Mean	SD	Range	LBC1936 Wave 1	LBC1936 Wave 3	LBC1936 Wave 5
ELSA
FI	5959	.17	0.11	0 – 0.68
Age	5959	72.73	7.2	65 – 99
LBC1936 Wave 1
FI	1005	.16	0.09	0 – 0.49	1***
Age	1005	69.58	0.83	67.66 – 71.35
LBC1936 Wave 3
FI	697	.20	0.09	0.02 – 0.65	.71***	1***
Age	697	76.30	0.68	74.64 – 77.75
LBC1936 Wave 5
FI	431	0.21	0.09	0.03 – 0.58	.57***	.74***	1***
Age	431	82.06	0.54	80.98-83.19