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Table 1 Sample characteristics: demographic variables

From: Trauma-focused treatment for posttraumatic stress disorder combined with CBT for severe substance use disorder: a randomized controlled trial

Demographics Total ( n = 34) TAU + SWT ( n = 19) TAU ( n = 15) Between group analyses
Mean age (SD) 42.3 (9.0) 42.6 (8.4) 41.9 (10.0) t (33) = 0.21, p = .84
Gender, n (%)     χ2 (1, N = 34) = 0.012, p = .92
Male 23 (67.6) 13 (68.4) 10 (66.7)  
Female 11 (32.4) 6 (31.6) 5 (33.3)  
Ethnicity, n (%)     χ2 (4, N = 34) = 2.962, p = .56
Dutch 23 (67.6) 13 (68.4) 10 (66.7)  
European (other) 2 (5.9) 1 (5.3) 1 (6.7)  
Arabic/ Moroccan/ Turkish 4 (11.8) 1 (5.3) 3 (20.0)  
Black/ Surinamese/ Caribbean 4 (11.8) 3 (15.8) 1 (6.7)  
Other 1 (2.9) 1 (5.3) 0 (0)  
Education (certificate), n (%)     χ2 (3, N = 34) = 0.404, p = .94
No education, primary school 11 (32.4) 6 (31.6) 5 (33.3)  
Secondary school, lower level 8 (23.5) 4 (21.1) 4 (26.7)  
Secondary school, higher level 9 (26.5) 5 (26.3) 4 (26.7)  
Postsecondary 6 (17.6) 4 (21.1) 2 (13.3)  
Relationship status, n (%)     χ2 (2, N = 34) = 2.859, p = .24
Single 31 (91.2) 17 (89.5) 14 (93.3)  
Partner 2 (5.9) 2 (10.5) 0 (0)  
Missing 1 (2.9) 0 (0) 1 (6.7)  
Source of income, n (%)     χ2 (2, N = 34) = 3.026, p = .22
No work 22 (64.7) 10 (52.6) 12 (80.0)  
Work 11 (32.4) 8 (42.1) 3 (20.0)  
Missing 1 (2.9) 1 (5.3) 0 (0)  
Dropouts, n (%)     
SUD treatment & SWT 13 (38.2) 9 (47.4) 4 (26.7) χ2 (1, N = 34) = 1.521, p = .30
SUD treatment 12 (35.3) 8 (42.1) 4 (26.7) χ2 (1, N = 34) = 0.875, p = .48
Baseline Measures     
Mean PDS (SD) 29.5 (10.0) 30.4 (9.7) 28.3 (10.7) t (33) = 0.62, p = .54
Mean TLFB (SD) 20.0 (27.2) 19.9 (29.3) 20.1 (25.4) t (33) = 0.19, p = .99
  1. Note: TAU Treatment As Usual, SWT Structured Writing Treatment.