Table 5.

Within-pair effects of adolescent-limited and continuing alcohol use.

	Effects of Adolescent Drinking				Effects of Change in Drinking
Measure	Estimate	95% CI	z-statistic	p-value	Estimate	95% CI	z-statistic	p-value
Overall Learning	−0.599	[−0.944 — −0.254]	3.41	.001	−0.807	[−1.390 — −0.223]	2.71	.007
Learning Over Trials	−0.436	[−0.775 — −0.126]	2.75	.006	−0.684	[−1.338 — −0.030]	2.05	.041
Trial 5 Total	−0.155	[−0.254 — −0.056]	3.07	.002	−0.197	[−0.366 — −0.029]	2.29	.022
Trial 1 Total	−0.033	[−0.105 — 0.040]	0.89	.376	−0.025	[−0.169 — 0.120]	0.33	.739
Trial B Total	−0.063	[−0.140 — 0.013]	1.62	.106	−0.076	[−0.247 — 0.094]	0.88	.380

Note: Estimate is the parameter estimate for the within-pair effect and 95% CI the 95% confidence interval around it, obtained by means of the cluster-robust sandwich estimator of standard errors in svyglm. Parameter estimates are adjusted for any effects of sex and zygosity. In addition, estimates for each twin-difference drinking measure are adjusted for effects of the other. “Effects of Adolescent Drinking” give associations between task performance measures and cumulative drinking through the age-20 assessment whereas “Effects of Change in Drinking” give associations for the change in drinking between the age-20 and age-29 assessments and the same performance measures.