Table 1.

Descriptive statistics and twin Correlations and 95% CIs for Borderline Personality Disorder (BPD) traits, Major Depressive Disorder (MDD) symptoms, Alcohol Use Disorder (AUD) symptoms, and Drug Use Disorder (DUD) symptoms across ages 14 to 24

	Raw Mean (SD)	Raw Range	Transformed Mean (SD)	Transformed Range	Twin Correlations
					rMZ	rDZ
BPD14	41.14 (9.53)	18.45, 70.78	.39 (0.17)	−.01,.91	.49 (.40, .57)	.38 (.25, .50)
BPD17	40.71 (8.72)	19.39, 70.59	.38 (0.15)	.01,.91	.50 (.43, .57)	.27 (.16, .38)
BPD20	37.78 (8.52)	18.16, 64.82	.33 (0.15)	−.01,.80	.37 (.24 .49)	.23 (.03, .41)
BPD24	35.53 (7.84)	18.14, 62.39	.29 (0.14)	−.02,.76	.48 (.40, .56)	.23 (.10, .35)
MDD14	.72 (1.89)	0, 9	.71 (0.61)	0, 2.84	.30 (.20, .40)	.30 (.16, .42)
MDD17	1.28 (2.49)	0, 9	1.27 (0.78)	0, 3.17	.35 (.27, .42	.29 (.18, .39)
MDD20	.96 (2.22)	0, 9	.96 (0.7)	0, 2.95	.27 (.18 .36)	.21 (.09, .33)
MDD24	1.25 (2.53)	0, 9	1.25 (0.78)	0, 3.22	.19 (.09, .29)	.17 (.04, .30)
AUD14	.07 (0.48)	0, 9	.04 (0.2)	−.18, 2.32	.52 (.44, .59)	.30 (.16, .43)
AUD17	.34 (1.06)	0, 9	.15 (0.42)	−.32, 2.34	.55 (.49, .61	.17 (.05, .29)
AUD20	.45 (1.12)	0, 9	.25 (0.47)	−.28, 2.39	.29 (.20 .38)	.25 (.13, .37)
AUD24	.52 (1.23)	0, 9	.27 (0.5)	−.24, 2.34	.37 (.28, .45)	.13 (.00, .26)
DUD14	.08 (0.57)	0, 8	.04 (0.23)	−.1, 2.21	.35 (.25, .44)	.43 (.30, .54)
DUD17	.27 (1.09)	0, 9	.11 (0.39)	−.43, 2.34	.47 (.40 .54	.36 (.25, .46)
DUD20	.34 (1.19)	0, 9	.16 (0.44)	−.13, 2.39	.35 (.27 .43)	.36 (.25, .46)
DUD24	.29 (1.03)	0, 9	.13 (0.4)	−.02, 2.31	.55 (.48, .62)	.12 (−.01, .24)

Note: MDD, AUD, and DUD symptom variables underwent a log+1 transformation for all analyses, after which they were corrected for age variability around each age of assessment (accounting for negative values under transformed range); MZ and DZ correlations are presented for the log-transformed values.