Table 1. Subject characteristics by age group.
| Age ≤ 16 (n=956) |
Age 17-20 (n=3147) |
Age ≥21 (n=1834) |
P value | |
|---|---|---|---|---|
| Age, * yrs | 15.4± 0.8 | 18.5 ± 1.1 | 23.7 ± 3.3 | |
| Race N (%) | ||||
| African American | 817 (85.5) | 2398(76.2) | 1278(69.7) | <0.001 |
| Caucasian | 131 (13.7) | 717 (22.8) | 481 (26.2) | |
| Other | 8 (0.8) | 32 (1.0) | 75 (4.1) | |
| BMI kg/m2 * | 24.3 ± 5.0 | 24.9 ± 5.8 | 26.9 ± 7.0 | <0.001 |
| Married N (%) | 25 (2.7) | 214 (7.0) | 286 (16.0) | <0.001 |
| Tobacco use N (%) | 122 (13.9) | 613 (20.7) | 438 (25.1) | <0.001 |
| Alcohol use N (%) | 72 (8.3) | 378 (12.8) | 421 (24.2) | <0.001 |
| Gest. age at del.*(wks) | 39.7 ± 1.2 | 39.8 ± 1.3 | 39.8 ± 1.3 | 0.151 |
| Birth weight * (gms) | 3219 ± 414 | 3242 ± 443 | 3255 ± 462 | 0.131 |
| Head circumference* (cm) | 33.8 ± 2.1 | 33.9 ± 2.3 | 33.8 ± 2.4 | 0.538 |
| Sphincter tear (3°/4°) N (%) | 88 (9.2) | 251 (8.0) | 176 (9.6) | 0.120 |
| Laceration- any type N (%) (1st,2nd,3rd, 4th degree) |
352 (36.8) | 1198 (38.1) | 783 (42.7) | 0.001 |
| Episiotomy N (%) | 443 (50.9) | 1372 (49.3) | 776 (47.8) | 0.342 |
| Forceps use N (%) | 115 (12.0) | 390 (12.4) | 299 (16.3) | 0.000 |
| Vacuum use N (%) | 133 (13.9) | 330 (10.5) | 184 (10.0) | 0.004 |
| Shoulder dystocia N (%) | 13 (1.4) | 49 (1.6) | 27 (1.5) | 0.902 |
*
Mean±SD