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Table 2 Socio-demographic characteristics of respondents at baseline before and after adjusting for propensity score

From: Effectiveness of a peer-led HIV prevention intervention in secondary schools in Rwanda: results from a non-randomized controlled trial

Variable Intervention allocation P-Value P-Value
  Control group Intervention group   
  Rwamagana Bugesera Before Adjustment* After Adjustment**
Sex n (%)     
  Male 417 (47.55) 543 (50.70) 0.17 0.80
Age     
  Mean (sd) 17.60 (2.30) 18.41 (2.18) <0.01 0.95
Ever had sex n (%)     
  Yes 196 (22.55) 302 (28.76) <0.01 0.91
Condom at last intercourse n (%)     
  Yes 52 (6.39) 99 (10.25) 0.13 0.98
  Never had sex 679 (83.42) 755 (78.16) 0.21 0.94
Intercourse in last 6 months n (%)     
  Yes 62 (7.09) 118 (11.24) <0.01 0.98
Ever tested for HIV n (%)     
  Yes 369 (43.11) 564 (56.29) <0.01 0.73
  Don’t know 17 (1.99) 19 (1.90) 0.51 0.88
Socio-economic status n (%)     
  Middle 399 (45.65) 349 (32.80) <0.01 0.63
  High 47 (5.38) 38 (3.57) <0.01 0.11
Live during the year n (%)     
  Boarding school, off campus 14 (1.64) 209 (20.47) <0.01 <0.05
  Parents/Family 283 (33.06) 430 (42.12) <0.01 0.90
Baseline HIV knowledge     
  Mean (sd) 6.12 (1.80) 5.91 (1.90) <0.05 0.94
  1. *Calculated using simple regression models with the baseline characteristic as the outcome of interest, and the intervention group as the independent variable.
  2. **Calculated using multiple regression models. Observations whose propensity scores fell outside of the minimum and maximum values for the opposite group were eliminated from the analysis. A model was fit with the baseline characteristic as the outcome of interest, and the intervention group as the independent variable. It was adjusted for the propensity score.