Treatment-specific cohort characteristics
| . | No treatment (n = 137) . | IVIg (n = 47) . | Corticosteroids (n = 51) . | P value . | |
|---|---|---|---|---|---|
| All groups . | IVIg vs corticosteroids . | ||||
| Maternal age (y), mean (SD) | 32.7 (4.1) | 31.1 (4.8) | 30.5 (5.1) | .01 | .52 |
| Nulliparity (n), (%) | 47 (34.3) | 27 (57.5) | 26 (51.0) | .01 | .52 |
| BMI (kg/m2), mean (SD) | 27.9 (6.3) | 27.9 (6.7) | 28.5 (5.8) | .92 | .70 |
| Age at ITP diagnosis, mean (SD) | 24.9 (7.2) | 27.2 (6.5) | 26.7 (6.0) | .10 | .72 |
| Maternal pretreatment platelet count (×109/L), mean (SD) | NA | 49 (25) | 50 (22) | — | .80 |
| Neonatal platelet nadir (×109/L), mean (SD) | 106 (76) | 35 (21) | 43 (26) | <.0001 | .11 |
| Gestational age at platelet nadir (wk), median (IQR) | 36.0 (27.3-38.0) | 36.0 (30.0-38.0) | 34 (28.8-37.0) | .31 | .18 |
| Operative vaginal* delivery (n/N), (%) | 9/106 (8.5) | 1/35 (2.9) | 1/43 (2.3) | .38 | .99 |
| Cesarean section, n (%) | 53 (38.7) | 20 (42.6) | 15 (29.4) | .36 | .17 |
| . | No treatment (n = 137) . | IVIg (n = 47) . | Corticosteroids (n = 51) . | P value . | |
|---|---|---|---|---|---|
| All groups . | IVIg vs corticosteroids . | ||||
| Maternal age (y), mean (SD) | 32.7 (4.1) | 31.1 (4.8) | 30.5 (5.1) | .01 | .52 |
| Nulliparity (n), (%) | 47 (34.3) | 27 (57.5) | 26 (51.0) | .01 | .52 |
| BMI (kg/m2), mean (SD) | 27.9 (6.3) | 27.9 (6.7) | 28.5 (5.8) | .92 | .70 |
| Age at ITP diagnosis, mean (SD) | 24.9 (7.2) | 27.2 (6.5) | 26.7 (6.0) | .10 | .72 |
| Maternal pretreatment platelet count (×109/L), mean (SD) | NA | 49 (25) | 50 (22) | — | .80 |
| Neonatal platelet nadir (×109/L), mean (SD) | 106 (76) | 35 (21) | 43 (26) | <.0001 | .11 |
| Gestational age at platelet nadir (wk), median (IQR) | 36.0 (27.3-38.0) | 36.0 (30.0-38.0) | 34 (28.8-37.0) | .31 | .18 |
| Operative vaginal* delivery (n/N), (%) | 9/106 (8.5) | 1/35 (2.9) | 1/43 (2.3) | .38 | .99 |
| Cesarean section, n (%) | 53 (38.7) | 20 (42.6) | 15 (29.4) | .36 | .17 |
BMI, body mass index; NA, not applicable.
Operative vaginal deliveries were carried out by vacuum extraction in all but 1 case in the nontreatment group, in which forceps were used.