Table 5. Association between Motivational Interviewing (MI) Trainings Attended and MI Performance and Global Rating
MI MeasureTraining Sessions
3 Sessions (n = 47)2 Sessions (n = 21)1 Session (n = 17)Control (n = 86)
MI performance score
    MI-consistent statement rate (per 10 minutes of the encounter) (95% CI)9.59 (8.5–10.7)8.55 (7.0–10.2)6.92 (5.1–8.7)6.96 (6.2–7.8)
    3 MI training sessions vs comparator, Cohen d (95% CI), P value0.28 (−0.21 to 0.77), .2900.72 (0.21–1.24), .0120.71 (0.36–1.06), <.001
Global Rating
    Beginning Spirit in MI Spirit (3.5 or higher) (95% CI)0.49 (0.22–0.77)0.25 (0.04–0.72)0.18 (0.02–0.67)0.15 (0.06–0.32)
    3 MI training sessions vs comparator, OR (95% CI), P value2.89 (0.27–31.21), .3804.27 (0.34–53.37), .265.6 (1.13–27.89), .036

  • Clinical effect sizes with Cohen's d: 0.2, small; 0.5, medium; 0.8, large. Clinical effect sizes with odds ratio (OR): 1.29, small; 1.88, medium; 2.79, large.44