Table 1.

Demographic and clinical variables by conversion status.

	Non-converters (N = 106)	Converters (N = 36)	Test statistic	p-value
Age at onset	21.38 (4.85)	19.63 (2.80)	t (117) = 1.876	p = 0.042
Age at assessment	29.17 (10.18)	29.39 (11.41)	t(142) = −0.108	p = 0.176
Sex (% female)	43.4%	30.1%	X2 (1) = 1.844	p = 0.174
Race (% Caucasian)	78.3%	69.5%	X2 (5) = 6.027	p = 0.304
Education (years)∧	15.11 (1.85)	14.39 (2.98)	t(142) = 1.715	p = 0.860
Comorbid SUD	60.4%	36.1%	X2 (1) = 6.375	p = 0.012
Comorbid anxiety disorder	42.5%	30.6%	X2 (1) = 1.593	p = 0.207
MADRS	15.07 (9.65)	13.85 (11.60)	t(139) = 0.606	p = 0.213
YMRS	12.03 (12.93)	9.91 (10.04)	t(140) = 0.882	p = 0.113
PANSS Positive	14.86 (7.60)	15.20 (7.44)	t(140) = −0.232	p = 0.922
PANSS Negative	11.95 (5.26)	13.75 (5.34)	t(137) = −1.686	p = 0.924
PANSS General	29.57 (8.50)	29.09 (9.51)	t(139) = 0.281	p = 0.526

SUD, Substance use disorder; MADRS, Montgomery-Asberg Depression Rating Scale; YMRS, Young Mania Rating Scale; PANSS, Positive and Negative Syndrome Scale.

^∧Education was collected using the SCID coding system. This ordinal system was converted to years of education for ease of interpretation using the following convention: less than high school (10 years), graduated high school (12 years), part college or graduated 2-year college (14 years), graduated 4-year college (16 years), part or complete graduate/professional school (18 years), unknown.

Bold values represent comparisons that reached statistical significance.