Table 2.

Descriptive statistics and zero-order correlations among study variables for the European ancestry sample (below diagonal) and African ancestry sample (above diagonal)

Measure	1	2	3	4	5	6	7
1. EXT PGS	–	.08	.02	−.07	.00	.03	.00
2. T1 Externalizing score	.17	–	−.29	.57	.57	−.31	.36
3. T1 Parental knowledge	−.12	−.48	–	−.26	−.25	.47	−.21
4. T1 Peer substance use	.14	.68	−.41	–	.36	−.24	.46
5. T2 Externalizing score	.23	.55	−.36	.48	–	−.41	.52
6. T2 Parental knowledge	−.12	−.27	.47	−.21	−.41	–	−.33
7. T2 Peer substance use	.19	.45	−.34	.57	.71	−.38	–
EA Mean	0.00	−0.22	3.49	1.13	−0.02	3.46	1.34
EA SD	0.99	0.79	0.57	0.32	1.00	0.57	0.51
AA Mean	0.00	−0.07	3.28	1.14	0.07	3.20	1.35
AA SD	0.99	0.67	0.73	0.30	1.04	0.76	0.48

Note. Abbreviations: SD = standard deviation. EXT PGS = Externalizing polygenic score. T1 = Time 1. T2 = Time 2. EA = participants of European ancestry. AA = participants of African ancestry. Correlations for the European ancestry sample are presented in the lower diagonal, and correlations for the African ancestry sample are presented in the upper diagonal. In the African ancestry sample, EXT PGS was constructed based on the weights from the discovery GWAS of European ancestry individuals. Bolded correlations indicate p < .05