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Distribution of IPIs (n = 66 759)
| Percentage of entire sample | Percentage of all cases with known duration of IPI | |
|---|---|---|
| IPI (months) | ||
| <6 | 5.6 | 9.7 |
| 6–14 | 6.0 | 10.4 |
| 15–26 | 13.1 | 22.9 |
| 27–50 | 21.3 | 37.4 |
| 51–74 | 7.5 | 13.2 |
| ≥75 | 3.6 | 6.4 |
| Unknown | 17.6 | — |
| First pregnancy | 25.3 | — |
