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The distribution of age and OC use among cases and controls.
| Case | ||
|---|---|---|
| No risk factor (%) | Risk factor (%) | |
| Age (years) | ||
| 15–19 | 10 (9.4) | 0 (0) |
| 20–24 | 18 (7.0) | 8 (30.8) |
| 25–29 | 29 (27.4) | 7 (26.9) |
| 30–34 | 30 (28.3) | 10 (38.5) |
| 35–39 | 19 (17.9) | 1 (3.8) |
| Mean age (years) | 28.7 | 28.8 |
| OC type | ||
| Levonorgestrel | 42 (39.6) | 16 (61.5) |
| Third generation | 64 (60.4) | 10 (38.5) |
| Total | 106 | 26 |
