Table 1. Multiple regression coefficients for effects of birth weight and gestational age on executive functions of boys at age 6.

Task	Measures	Birth Weight		Gestational Age
		β	p	β	p
IED	Stage 1 Errors	−.21	.004	.003	.97
	Pre-EDS errors	−.02	.84	−.04	.58
	EDS errors	−.15	.04	.03	.68
	Stages completeda	.08	.25	−.07	.33
SST	Mean reaction time	−.08	.26	−.21	.004
	Reaction time standard deviation	−.13	.06	−.22	.002
	Stop-signal reaction time	−.09	.22	−.11	.13
DMS	Total correct (12 seconds)	.20	.01	.07	.32
SWM	Between search errors (6 boxes)	.09	.21	−.01	.89
	Strategy	.01	.87	−.08	.28

Note. IED = intra/extra-dimensional shift task; EDS = extra-dimensional shift; SST = stop-signal task; DMS = delayed-matching-to-sample task; SWM = spatial working memory task.

^aLogistic regression used instead of multiple linear regression.