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Obstetrical, perinatal, and infantile difficulties experienced by subgroup (N = 338)
| Difficulties | Healthy controls (n = 98) | Non-affected siblings of BD probands (n = 120) | BD probands (n = 120) |
|---|---|---|---|
| N (%) | N (%) | N (%) | |
| Obstetrical | 56 (57) | 78 (65) | 79 (66) |
| Perinatal | 13 (13) | 16 (13) | 17 (14) |
| Infantile | 12 (12)a | 30 (25)b | 58 (48) |
Controls vs. BD probands, p < 0.05.
Non-affected siblings vs. BD probands, p < 0.05.
Abbreviations: BD = bipolar disorder.
