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Table 3 Intention to treat- comparison of groups on primary and secondary outcomes

From: The efficacy of a blended motivational interviewing and problem solving therapy intervention to reduce substance use among patients presenting for emergency services in South Africa: A randomized controlled trial

  Control MI MI-PST MI vs Control (Contrast 1) MI/CG vs MI-PST (Contrast 2)
(mean [1]) (mean [1]) (mean [1]) Adjusted Mean 95 % CI Adjusted Mean 95 % CI
    (diff [SE])   (difference [SE])  
Substance use: ASSIST
 Baseline 19.30 (5.78) 19.96 (6.49) 18.71 (6.32)     
 3 month follow-up 11.91 (6.94) 12.28 (6.81) 9.89 (6.64)     
 Adjusted Means (SE) 11.93 (0.66) 11.95 (0.72) 10.22 (0.78) −0.02 (1.00) −2.01-1.96 −1.72 (0.82) −3.36- -0.08*
Depression: CES-D
 Baseline 24.56 (6.02) 23.93 (5.43) 27.28 (8.22)     
 3 month follow-up 20.13 (7.09) 17.77 (8.12) 16.64 (8.17)     
Adjusted Means (SE) 17.78 (1.30) 15.64 (1.21) 13.38 (1.49) 2.15 (1.59) −0.99-5.29 −3.33 (1.46) −6.24- -0.42**
Verbal arguments
 Baseline 0.82 (1.56) 0.59 (1.21) 0.92 (3.02)     
 3 month follow-up 0.76 (0.97) 0.23 (0.77) 0.71 (1.18)     
Adjusted Means (SE) 0.60 (0.10) 0.37 (0.10) 0.52 (0.13) 0.24 (0.15) −0.05-0.54 0.04 (0.15) −0.27-0.34
Physical fights
 Baseline 0.49 (0.73) 0.50 (0.97) 0.55 (1.41)     
 3 month follow-up 0.45 (0.63) 0.28 (0.84) 0.23 (0.71)     
Adjusted Means (SE) 0.36 (0.07) 0.30 (0.07) 0.24 (0.07) 0.06 (0.09) 0.12-0.25 0.04 (0.15) −0.25-0.07
Police interactions
 Baseline 0.25 (0.63) 0.15 (0.36) 0.55 (1.41)     
 3 month follow-up 0.23 (0.60) 0.23 (0.56) 0.16 (0.59)     
Adjusted Means (SE) 0.19 (0.06) 0.24 (0.05) 0.16 (0.05) −0.05 (0.07) −0.19-0.09 −0.05 (0.07) −0.19- -0.09
Injuries
 Baseline 0.76 (0.72) 0.67 (0.84) 0.19 (0.53)     
 3 month follow-up 0.23 (0.49) 0.27 (0.53) 0.36 (0.54)     
Adjusted Means (SE) 0.25 (0.06) 0.26 (0.05) 0.30 (0.06) −0.01 (0.08) −0.16-0.14 0.04 (0.07) −0.10-0.18
Healthcare visits
 Baseline 0.67 (0.59) 0.55 (0.60) 0.45 (0.75)     
 3 month follow-up 0.54 (0.63) 0.49 (0.84) 0.56 (1.24)     
Adjusted Means (SE) 0.43 (0.09) 0.49 (0.08) 0.61 (0.08) −0.06 (0.11) −0.28-0.16 0.15 (0.10) −0.05-0.35
  1. *(t (332) = −2.08, p = 0.04)
  2. **(t (170) = 2.72, p = p > 0.001)