Table 2.
Baseline sample characteristics by depressive symptom subtype before propensity score weighting.
| Variable (mean (sd) or n (%)) | Asymptomatic (n=3,615) |
Catatonic (n=239) |
Anhedonic (n=474) |
Melancholic (n=158) |
P Value |
|---|---|---|---|---|---|
| Age | 61.24 (9.09) | 61.06 (9.37) | 61.87 (9.81) | 57.44 (8.27) | <0.001 |
| Female | 2054 (56.8) | 157 (65.7) | 283 (59.7) | 113 (71.5) | <0.001 |
| White | 630 (17.4) | 82 (34.6) | 122 (25.7) | 53 (33.5) | <0.001 |
| Marital status | <0.001 | ||||
| Married | 2537 (70.8) | 124 (52.1) | 267 (56.3) | 75 (47.8) | |
| Widowed | 250 (7.0) | 30 (12.6) | 59 (12.4) | 13 (8.3) | |
| Divorced | 467 (13.0) | 41 (17.2) | 80 (16.9) | 34 (21.7) | |
| Separated | 45 (1.3) | 11 (4.6) | 11 (2.3) | 8 (5.1) | |
| Never Married | 285 (8.0) | 32 (13.4) | 57 (12.0) | 27 (17.2) | |
| Education | <0.001 | ||||
| No Degree | 1265 (35.3) | 137 (57.6) | 252 (53.2) | 97 (61.4) | |
| College Degree | 1111 (31.0) | 53 (22.3) | 123 (25.9) | 37 (23.4) | |
| Graduate Degree | 1208 (33.7) | 48 (20.2) | 99 (20.9) | 24 (15.2) | |
| Employment | 2272 (62.9) | 133 (55.6) | 279 (59.0) | 88 (55.7) | 0.022 |
| Health insurance | 3507 (97.9) | 219 (92.0) | 442 (94.0) | 138 (87.3) | <0.001 |
| Smoking | <0.001 | ||||
| Never | 1944 (54.6) | 104 (43.9) | 232 (49.5) | 78 (50.0) | |
| Current | 177 (5.0) | 29 (12.2) | 41 (8.7) | 30 (19.2) | |
| Former | 1438 (40.4) | 104 (43.9) | 196 (41.8) | 48 (30.8) | |
| Alcohol consumption | 0.015 | ||||
| None | 641 (17.9) | 55 (23.1) | 104 (22.0) | 42 (26.6) | |
| Minimal | 2634 (73.5) | 163 (68.5) | 338 (71.5) | 105 (66.5) | |
| Moderate | 307 (8.6) | 20 (8.4) | 31 (6.6) | 11 (7.0) | |
| Charlson comorbidity | 0.34 (0.78) | 0.54 (1.04) | 0.54 (1.04) | 0.68 (1.03) | <0.001 |
| BMI | 28.40 (4.68) | 29.33 (5.27) | 29.17 (5.14) | 29.94 (5.79) | <0.001 |
| Symptomatic knee OA | 1224 (33.9) | 116 (48.5) | 202 (42.6) | 84 (53.2) | <0.001 |
| K-L grade | <0.001 | ||||
| 0 | 1455 (40.2) | 74 (31.0) | 163 (34.4) | 52 (32.9) | |
| 1 | 650 (18.0) | 42 (17.6) | 81 (17.1) | 32 (20.3) | |
| 2 | 916 (25.3) | 61 (25.5) | 127 (26.8) | 52 (32.9) | |
| 3 | 484 (13.4) | 54 (22.6) | 79 (16.7) | 19 (12.0) | |
| 4 | 110 (3.0) | 8 (3.3) | 24 (5.1) | 3 (1.9) | |
| History of knee injury | 938 (26.2) | 69 (29.0) | 133 (28.4) | 48 (30.4) | 0.419 |
| Analgesic use | 1238 (34.3) | 108 (45.6) | 196 (41.4) | 95 (60.5) 21.97 | <0.001 |
| WOMAC | 10.18 (13.17) | 17.40 (18.81) | 15.51 (17.64) | (20.28) | <0.001 |
| CES-D score | 4.03 (3.56) | 13.92 (4.59) | 13.85 (4.47) | 28.97 (7.2) | <0.001 |
| CES-D score ≥ 16 | 15 (0.4) | 87 (36.7) | 170 (36.2) | 158 (100.0) | <0.001 |
BMI: Body mass index; CES-D: Center for Epidemiologic Studies Depression scale; K-L grade: Kellgren-Lawrence grade; OA: Osteoarthritis; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index.