Table 1. Baseline Demographic Characteristics
All (n = 7349)CCM (n = 3595)UC (n = 3754)P Value*
Age (years), mean (SD)41.8 (16.5)41.1 (15.7)42.5 (17.2).0080
Female sex, n (%)5169 (70.4)2620 (73.1)2549 (67.9)<.0001
Marital status (married) , n (%)3767 (51.3)1890 (52.7)1877 (50.0).023
Race (white) , n (%)6721 (91.6)3347 (93.3)3374 (89.9)<.0001
Clinical site, n (%)<.0001
    A3547 (48.3)1164 (32.5)2383 (63.5)
    B950 (12.9)464 (12.9)486 (13.0)
    C1503 (20.5)954 (26.5)549 (14.6)
    D1340 (18.3)1004 (28.0)336 (9.0)
Diagnosis code, n (%)<.0001
    296.2x3729 (50.8)1866 (52.0)1863 (49.6)
    296.3x2596 (35.4)1427 (39.8)1169 (31.1)
    300.41015 (13.8)293 (8.2)722 (19.2)
Initial PHQ-9 score, mean (SD)15.4 (4.1)15.6 (4.1)15.1 (4.1)<.0001
    Moderate, n (%)3564 (48.6)1633 (45.5)1931 (51.4)
    Moderately severe, n (%)2485 (33.9)1287 (35.9)1198 (31.9)
    Severe, n (%)1291 (17.6)666 (18.6)625 (16.6)
  • * Calculated using the χ2 test for categorical variables and Wilcoxon rank sum test for ordinal variables.

  • CCM, collaborative care management; PHQ-9, 9-item Patient Health Questionnaire; SD, standard deviation; UC, usual care.