Table 2. Sex and Birth Characteristics of Children in the 1976-1982 Rochester, Minnesota Birth Cohort (N=5320*).
| Variable | Vaginal Delivery (N=4,823) | Cesarean delivery with general (N=193) | Cesarean delivery with regional (N=304) | P-value |
|---|---|---|---|---|
| Sex | 0.15 | |||
| Female | 2,321 (48%) | 99 (51%) | 131 (43%) | |
| Male | 2,502 (52%) | 94 (49%) | 173 (57%) | |
| Number at birth | < 0.001 | |||
| Single | 4,752 (99%) | 181 (94%) | 287 (94%) | |
| Twin | 71 (1%) | 12 (6%) | 17 (6%) | |
| Birth weight (grams) | 3,477 ± 528.0 | 3,248 ± 779 | 3,453 ± 609 | <0.001 |
| Birth weight | < 0.001 | |||
| < 2500 | 178 (4%) | 31 (16%) | 16 (5%) | |
| 2500+ | 4,635 (96%) | 162 (84%) | 288 (95%) | |
| Gestational age | 40.1 ± 2.0 | 39.3 ± 3.2 | 39.5 ± 2.2 | <0.001 |
| Gestational age (weeks) | <0.001 | |||
| Less than 31.9 | 30 (1%) | 8 (4%) | 3 (1%) | |
| 32 to 36.9 | 241 (5%) | 27 (15%) | 23 (8%) | |
| 37+ | 4,250 (94%) | 145 (81%) | 264 (91%) | |
| APGAR score (1 minute) | 8.0 ± 1.3 | 6.8 ± 1.7 | 7.4 ± 1.8 | < 0.001 |
| APGAR score (5 minutes) | 9.2 ± 0.7 | 8.6 ± 1.0 | 8.8 ± 0.9 | < 0.001 |
APGAR, Appearance, Pulse, Grimace, Activity, Respiration score
*
Birth weight was missing for 10 (0.2%) and gestational age was missing for 329 (6.2%). APGAR scores were only available children born in 1980-1982 (N=1360).