Table 3.

Increase (%) in reaction times on cognitive performance tasks (CogState) according to 1 month older age at first walking

	Model 1			Model 2			Model 3
	%	95 % CI	p value	%	95 % CI	p value	%	95 % CI	p value
SRT	11.03	1.14, 21.89	0.028	10.68	0.88, 21.43	0.032	10.32	0.48, 21.12	0.039
CRT	14.79	4.43, 26.18	0.004	14.74	4.32, 26.17	0.005	14.17	3.75, 25.63	0.007
WM	14.82	4.77, 25.84	0.003	15.40	5.26, 26.53	0.002	15.14	4.95, 26.32	0.003
DA	7.51	−1.87, 17.77	0.120	7.07	−.2.28, 17.31	0.143	7.26	−2.17, 17.59	0.135

Longer reaction times indicate poorer performance on the task

SRT simple reaction time task, CRT choice reaction time task, WM working memory, DA divided attention task, Model 1 adjusted for age and gender, Model 2 adjusted for model 1 and father’s occupational status and own highest attained education, Model 3 adjusted for model 2 and adult occupational status