TABLE 2.

Associations between demographic and life‐course predictors and choice reaction time outcomes (n = 501)

Predictor	RT (ms): coefficient and 95% CIs	Odds ratio for making an error and 95% CIs	Intra‐individual variability in RT: coefficient and 95% CIs
Sex (female as reference)	−8.5 (−22.9, 7.8)	1.11 (0.85, 1.45)	−0.0050 (−0.0109, 0.0010)
Age at assessment (per year)	24.0 * , † (14.7, 35.4)	0.81 * (0.68, 0.98)	0.0085 * , † (0.0043, 0.0128)
Childhood cognitive ability (per z‐score)	−11.6 * (−23.2, −0.08)	0.73 * , † (0.60, 0.89)	−0.0036 (−0.0082, 0.0009)
Education (per category) ‡	−4.6 (−11.6, 1.6)	1.06 (0.92, 1.21)	−0.0030 * (−0.0058, −0.0002)
Socioeconomic position (per category) ‡	−2.2 (−13.2, 6.3)	1.04 (0.91, 1.19)	0.0027 (−0.0005, 0.0059)
Neurological or psychiatric condition (cognitively normal as reference) ‡	9.5 (−13.2, 40.3)	1.58 * , † (1.14, 2.19)	0.0149 * , † (0.0050, 0.0247)

Abbreviations: CI, confidence interval; IIV, intra‐individual variability; RT, reaction time.

^*Significant at P < 0.05.

^†Significant at P < 0.01.

^‡See section 2.2 for definitions.

Positive coefficients on RT reflect slower responses; odds ratios >1 for errors reflect higher error rates; positive coefficients on IIV reflect more variable responses. Multivariable regression models were used so each association is independent of all others.