Table S2.

Differences in baseline measures between participants with or without marijuana use information in the RFAB and MTFS studies

Baseline variablesRFABMTFS
Missing (n = 427)Not missing (n = 789)Significant, PMissing (n = 220)Not Missing (n = 2,277)Significant, P
Age, y9.6 ± 0.69.6 ± 0.611.8 ± 0.411.8 ± 0.4
SES, percentile52.8 ± 28.857.5 ± 30.4<0.0542.3 ± 19.750.8 ± 21.4<0.05
Male, %54.445.6<0.0554.148.4
MZ, %48.944.8<0.0566.462.4
Race, %
 Caucasian20.430.3<0.0595.593.0
 African American18.111.8
 Hispanic39.736.4
 Asian5.43.9
 Multiracial16.417.6
IQ subtest
 Vocabulary96.5 ± 14.7101.9 ± 14.8<0.0597.6 ± 14.9100.2 ± 15.0<0.05
 Information98.9 ± 15.3100.1 ± 15.0
 Similarities96.9 ± 15.2101.7 ± 14.7<0.05
 Block Design99.1 ± 14.5100.5 ± 15.296.7 ± 15.2100.3 ± 14.9<0.05
 Matrix Reasoning98.5 ± 15.8100.8 ± 14.5<0.05
 Picture Arrangement97.5 ± 15.0100.2 ± 15.0<0.05