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. 2021 Oct 28;12:734272. doi: 10.3389/fpsyt.2021.734272

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.