Table 2.
Maternal Demographics and Labor Characteristics for Multiparas
| BMI Categories (kg/m2) at Admission | |||||||
|---|---|---|---|---|---|---|---|
| Characteristic | <25.0 | 25.0–29.9 | 30.0–34.9 | 35.0–39.9 | ≥40.0 | Total | P-value |
| Total | 8541 | 24,001 | 16,956 | 7523 | 4495 | 61,516 | |
| Maternal age (years) Mean (SD) | 28.4 (5.5) | 29.0 (5.5) | 29.0 (5.5) | 28.8 (5.5) | 28.8 (5.3) | 28.9 (5.5) | <0.0001 |
| Maternal height (m) Mean (SD) | 1.65 (0.07) | 1.64 (0.07) | 1.63 (0.07) | 1.63 (0.08) | 1.62 (0.09) | 1.64 (0.07) | <0.0001 |
| Maternal weight (kg) at labor admission Mean (SD) | 64.0 (6.3) | 74.1 (7.1) | 85.9 (8.4) | 98.8 (8.4) | 118.1 (17.2) | 82.2 (16.8) | <0.0001 |
| White race N (%) | 5297 (62.0) | 13,929 (58.0) | 8303 (49.0) | 3193 (42.4) | 1758 (39.1) | 32,480 (52.8) | <0.0001 |
| Black race N (%) | 1222 (14.3) | 3706 (15.4) | 3626 (21.4) | 2183 (29.0) | 1710 (38.0) | 12,447 (20.2) | |
| Hispanic race N (%) | 1193 (14.0) | 4176 (17.4) | 3756 (22.2) | 1661 (22.1) | 762 (17.0) | 11,548 (18.8) | |
| Gestational age (weeks) Mean (SD) | 39.0 (1.0) | 39.1 (1.0) | 39.2 (1.1) | 39.2 (1.1) | 39.2 (1.1) | 39.1 (1.0) | <0.0001 |
| Diabetes N (%) | 170 (2.0) | 759 (3.2) | 857 (5.1) | 535 (7.1) | 488 (10.9) | 2809 (4.6) | <0.0001 |
| Dilation at admission (cm) Mean (SD) | 4.1 (2.2) | 3.9 (2.1) | 3.7 (2.1) | 3.5 (2.1) | 3.3 (2.1) | 3.8 (2.1) | <0.0001 |
| Effacement at admission (%) Mean (SD) | 78.4 (18.9) | 75.8 (20.1) | 72.2 (22.3) | 69.1 (24.0) | 65.4 (25.3) | 73.7 (21.7) | <0.0001 |
| Number of cervical exams Mean (SD) | 6.2 (2.7) | 6.5 (2.8) | 6.7 (3.1) | 6.9 (3.2) | 7.1 (3.5) | 6.6 (3.0) | <0.0001 |
| Induction N (%) | 3064 (35.9) | 9571 (39.9) | 7460 (44.2) | 3624 (48.2) | 2390 (53.2) | 26,139 (42.5) | <0.0001 |
| Augmentation N (%) | 2890 (33.8) | 8166 (34.0) | 5786 (34.1) | 2517 (33.5) | 1468 (32.7) | 20,827 (33.9) | 0.37 |
| Epidural analgesia N (%) | 6083 (71.2) | 17,629 (73.5) | 12,225 (72.1) | 5425 (72.1) | 3206 (71.3) | 44,568 (72.5) | 0.0001 |
| Operative vaginal delivery N (%) | 334 (3.9) | 930 (3.9) | 620 (3.7) | 266 (3.5) | 130 (2.9) | 2280 (3.7) | 0.02 |
| Cesarean delivery N (%) | 181 (2.1) | 802 (3.3) | 911 (5.4) | 602 (8.0) | 524 (11.7) | 3020 (4.9) | <0.0001 |
| Cesarean performed for labor abnormality N(%) | 63 (34.8) | 345 (43.0) | 419 (46.0) | 297 (49.3) | 234 (44.7) | 1358 (45.0) | 0.0078 |
| Birth weight (g) Mean (SD) | 3213 (405) | 3364 (415) | 3444 (441) | 3480 (454) | 3498 (485) | 3389 (440) | <0.0001 |
BMI body mass index
SD standard deviation
a
P-Values are from statistical tests (Pearson Chi-Square tests for categorical variables and analysis of variance for continuous variables) assessing the overall relationship between the characteristic and BMI category.