Variables | Household income level | |||
---|---|---|---|---|
Lower (N = 27,258) | Middle (N = 20,066) | Upper (N = 18,155) | P value (Df = 1)a | |
Number (%) | Number (%) | Number (%) | ||
Age group | ||||
15–19 years | 165 (1.01) | 85 (0.29) | 43 (0.21) | <.001 |
20–24 years | 1733 (10.66) | 1453 (5) | 602 (2.9) |  |
25–29 years | 6592 (40.55) | 11,786 (40.57) | 5888 (28.4) |  |
30–34 years | 5743 (35.33) | 12,528 (43.12) | 10,278 (49.58) |  |
35–39 years | 1683 (10.35) | 2784 (9.58) | 3400 (16.4) |  |
40–44 years | 341 (2.1) | 417 (1.44) | 520 (2.51) |  |
Worker | 4411 (27.13) | 7417 (25.53) | 3877 (18.7) | <.001 |
Obstetric characteristics b | ||||
Nulliparity | 10,543 (64.85) | 18,882 (64.99) | 12,135 (58.54) | <.001 |
Multiple gestation | 171 (1.05) | 325 (1.12) | 364 (1.76) | <.001 |
Diabetes | 217 (1.33) | 400 (1.38) | 411 (1.98) | <.001 |
Induction of labor | 2933 (18.04) | 5485 (18.88) | 3905 (18.84) | 0.066 |
Cesarean delivery | 6157 (37.87) | 10,680 (36.76) | 7593 (36.63) | 0.018 |
Outcomes | ||||
Preeclampsia treated with MgSO4 | 153 (0.94) | 235 (0.81) | 174 (0.84) | 0.332 |
Postpartum hemorrhage requiring blood transfusion | 420 (2.58) | 701 (2.41) | 469 (2.26) | 0.046 |