Table 2.

Zero-inflated model estimates predicting negative consequences and potential AD symptoms

		Negative consequences						Potential symptoms of AD
		Zero inflation			Expected count			Zero inflation			Expected count
		Estimate	SE	P	Estimate	SE	P	Estimate	SE	P	Estimate	SE	P
Similarity to MO
Age	Baseline	0.001	0.072	0.000	−0.390	0.208	0.061	0.426	0.102	0.000	−0.663	0.196	0.001
	Δ Across 20 years	0.802	0.731	0.273	0.280	0.880	0.750	0.888	0.192	0.000	0.965	0.068	0.000
FA drinker status	Baseline	−0.250	0.075	0.001	0.204	0.163	0.211	−0.214	0.122	0.078	−0.173	0.199	0.384
	Δ Across 20 years	0.465	0.549	0.397	0.473	0.246	0.055	−0.027	0.328	0.935	0.187	0.275	0.498
MO drinker status	Baseline	0.284	0.081	0.000	−0.120	0.160	0.453	−0.231	0.089	0.874	0.175	0.148	0.237
	Δ Across 20 years	0.484	0.476	0.309	0.562	0.220	0.011	−0.056	0.356	0.874	0.000	0.190	0.998
Similarity to MO	Baseline	0.008	0.087	0.927	−0.098	0.128	0.441	−0.096	0.110	0.382	−0.282	0.173	0.102
	Δ Across 20 years	0.147	0.507	0.772	0.136	0.305	0.655	0.617	0.421	0.142	0.394	0.236	0.094
Similarity × MO drinker status	Baseline	−0.049	0.098	0.620	−0.033	0.168	0.843	−0.210	0.094	0.000	−0.030	0.179	0.867
	Δ Across 20 years	−0.077	0.573	0.894	0.538	0.191	0.005	0.366	0.444	0.410	0.467	0.197	0.018
Similarity to FA
Age	Baseline	0.400	0.079	0.000	−0.352	0.318	0.269	0.376	0.119	0.002	−0.619	0.199	0.002
	Δ Across 20 years	0.672	0.834	0.420	0.201	0.802	0.802	0.597	0.299	0.046	0.839	0.218	0.000
MO drinker status	Baseline	−0.257	0.100	0.010	−0.073	0.251	0.772	−0.154	0.089	0.084	0.253	0.096	0.008
	Δ Across 20 years	0.531	0.527	0.313	0.624	0.307	0.042	−0.072	0.182	0.692	0.008	0.173	0.963
FA drinker status	Baseline	−0.255	0.088	0.004	−0.211	0.163	0.194	−0.230	0.109	0.035	−0.212	0.159	0.181
	Δ Across 20 years	0.434	0.538	0.432	0.274	0.371	0.461	0.017	0.288	0.953	0.195	0.290	0.501
Similarity to FA	Baseline	−0.045	0.074	0.543	0.060	0.136	0.658	0.189	0.105	0.070	0.492	0.153	0.001
	Δ Across 20 years	0.129	0.552	0.815	0.187	0.350	0.593	−0.805	0.220	0.000	−0.568	0.274	0.038
Similarity × FA drinker status	Baseline	0.062	0.084	0.460	0.124	0.138	0.368	0.105	0.091	0.249	0.143	0.146	0.330
	Δ Across 20 years	−0.202	0.507	0.691	−0.483	0.239	0.043	−0.075	0.264	0.776	−0.082	0.210	0.698

Note. Estimates with an association of P < 0.05 are in bold-face font. MO = Mother, FA = Father, Δ = Change. Standardized estimates are given as logits values. The ‘Zero Inflation’ part of the ZIP model is a logistic regression predicting log odds of a subpopulation of participants who are unable to report non-zero consequences, due to alcohol abstention. The ‘Expected Count’ part of the model is a Poisson regression, estimating the number of expected consequences (i.e. natural log of the expected count) in a subpopulation of participants who are able to report scores of zero and above (i.e. not alcohol abstainers).