Table 2. Cox Proportional Hazard Model for Remission of Depressive Symptoms
Hazard Ratio for Remission* (95% CI)P Value
Group
    UCReference
    CCM2.48 (2.31–2.65)<.0001
Age (years)
    18–50Reference
    51–641.00 (0.93–1.08).979
    65–791.43 (1.27–1.60)<.0001
    ≥801.29 (1.06–1.58).012
Sex.81
    FemaleReference
    Male1.01 (0.94–1.08)
Marital status<.0001
    Not marriedReference
    Married1.18 (1.11–1.26)
Race.113
    WhiteReference
    Nonwhite0.91 (0.80–1.02)
Clinic
    AReference
    B1.03 (0.93–1.14).563
    C1.34 (1.24–1.45)<.0001
    D1.27 (1.17–1.38)<.0001
Diagnosis
    InitialReference
    Recurrent0.87 (0.82–0.93)<.0001
    Dysthymia0.98 (0.89–1.08).681
Initial PHQ-9 score
    Moderate (10–14)Reference
    Moderately severe (15–19)0.80 (0.75–0.85)<.0001
    Severe (20–27)0.71 (0.65–0.77)<0.0001
  • * Remission is defined as a 9-item Patient Health Questionnaire (PHQ-9) score <5.

  • CCM, collaborative care management; CI, confidence interval; PHQ-9, 9-item Patient Health Questionnaire; UC, usual care.