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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: J Nerv Ment Dis. 2018 Apr;206(4):239–244. doi: 10.1097/NMD.0000000000000775

Table 2.

Tetrachoric Correlations (and 95% CIs) for Drug Abuse among Parents in Six of our Family Types

Nature of
Sample/Design		 Correlation Biological
Mother – Biological
Father		 Correlation
Biological
Mother-Step-
parent		 Correlation
Biological
Father-Step-
parent
Intact Families 0.32 (0.30; 0.34)
Triparental families 0.18 (0.13; 0.24) 0.36 (0.30; 0.43) 0.21 (0.16; 0.27)
Not-lived-with Father families 0.40 (0.38; 0.41) 0.26 (0.17; 0.34) 0.17 (0.08; 0.26)
Not-lived-with Mother families 0.60 (0.56; 0.64) 0.03 (−0.14; 0.19) 0.01 (−0.18; 0.21)
Stepfather families 0.51 (0.48; 0.54) 0.24 (0.20; 0.29) 0.22 (0.17; 0.27)
Stepmother families 0.65 (0.62; 0.68) 0.03 (−0.08; 0.13) 0.01 (−0.12; 0.14)