| Provider- and Patient-Level Measures | Intervention* Mean or Proportion (SD) n = 85 | Control† Mean or Proportion (SD) (n = 86) | P Value | Adjusted Odds Ratio or Cohen's d** (95% CI) |
|---|---|---|---|---|
| Summary MI performance | ||||
| Rate of MI-consistent statements‡ | 8.80 (4.16) | 6.98 (4.14) | .005 | d = 0.44 (0.13–0.74) |
| Summary global rating | ||||
| Beginning spirit in MI Spirit (≥3.5) | 0.37 (1.01) | 0.15 (0.59) | .083 | 3.28 (0.83–12.90) |
| Provider treatment advice | ||||
| Recommendation for physical activity | 0.34 (0.54) | 0.19 (0.43) | .053 | 2.21 (0.99–4.95) |
| Prescription for antidepressant medication | 0.42 (0.53) | 0.38 (0.51) | .66 | 1.17 (0.59–2.30) |
| Frequency of patient change talk | ||||
| Rate of all depression treatment-related‖ change talk‡ | 0.90 (0.91) | 0.44 (0.90) | .001 | d = 0.51 (0.21–0.82) |
| Rate of change talk specific to physical activity | 0.30 (0.51) | 0.10 (0.51) | .01 | d = 0.39 (0.09–0.70) |
| Rate of change talk specific to antidepressant medication | 0.25 (0.47) | 0.15 (0.46) | .17 | d = 0.21 (−0.09 to 0.51) |
| Treatment adherence | ||||
| Days physically active in past week,§ n¶ | 3.05 (2.83) | 1.84 (2.75) | .007 | d = 0.42 (0.11–0.72) |
| Filled prescription, % | 0.62 (0.17) | 0.56 (0.17) | .63 | 1.27 (0.48–3.34) |
Data are number (%) of participants unless stated otherwise.
↵* Motivational interviewing (MI) with standard management of depression training.
↵† Standard management of depression training alone.
↵‡ Mean rate of open questions, reflective statements, or MI-adherent statements per 10 minutes of the clinical encounter.
↵§ Physical activity was ascertained on average 5.4 days (standard deviation, 3.3 days) after the index encounter.
↵‖ Includes change talk regarding physical activity, antidepressant medication, specialty mental health counseling, and nonharmful behaviors the patient suggests might alleviate depressive symptoms.
↵¶ Days in the previous week during which patient engaged in at least 30 minutes of physical activity.
↵** Clinical effect sizes based on Cohen d values: 0.2, small; 0.5, medium; 0.8, large. Clinical effect sizes based on odds ratio (OR): 1.29, small; 1.88, medium; 2.79, large.44