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Cases diagnosed at admission for hospitalization (N=67, multiple answers possible).
| Diagnosis at admission | Valid cases, n (%) |
| Cervical insufficiency | 27 (40) |
| PROMa/premature labor | 19 (28) |
| IUGRb/oligohydramnios | 10 (15) |
| Vaginal bleeding | 8 (12) |
| Infections | 5 (7) |
| Placental disorder | 4 (6) |
| Fetal malformation | 4 (6) |
| Polyhydramnios | 3 (4) |
| Gestational diabetes | 3 (4) |
| Other | 9 (13) |
aPROM: prelabor rupture of membranes.
bIUGR: intrauterine growth restriction.
