Table 1.
Characteristics of cases and controls. Values are numbers (percentages) unless stated otherwise
| Characteristic | Cases (n=61) | Controls (n=215) | Unadjusted matched odds ratio (95% CI) |
|---|---|---|---|
| Mean (SD) age (years) | 32.2 (7.2) | 31.8 (7.4) | – |
| Body mass index category (kg/m2): | |||
| <20 | 2 (3) | 27 (13) | 0.4 (0.1 to 1.7) |
| 20-24.9 | 20 (33) | 101 (47) | 1.0 |
| 25-29.9 | 20 (33) | 42 (20) | 2.4 (1.2 to 4.8) |
| ≥30 | 15 (25) | 15 (7) | 5.5 (2.1 to 14.0) |
| Unknown | 4 (7) | 30 (14) | 0.7 (0.2 to 2.4) |
| History of varicose veins | 3 (5) | 9 (4) | 1.2 (0.3 to 4.4) |
| Smoking status: | |||
| Current smoker | 11 (18) | 47 (22) | 0.7 (0.3 to 1.5) |
| Former smoker | 9 (15) | 39 (18) | 0.7 (0.3 to 1.5) |
| Non-smoker | 41 (67) | 124 (58) | 1.0 |
| Unknown | 0 | 5 (2) | – |
| Current drug use: | |||
| Antipsychotic | 0 | 1 (<1) | – |
| Any antidepressant | 7 (11) | 11 (5) | 2.5 (0.9 to 7.1) |
| Tricyclic antidepressant | 3 (5) | 2 (1) | 5.1 (0.8 to 30.4) |
| Non-tricyclic antidepressant | 4 (7) | 9 (4) | 1.6 (0.5 to 5.0) |
| Tranexamic acid | 2 (3) | 0 | – |