TABLE 1.
Birth Characteristics and ASA-PS at the Age of 5 Years
| Characteristic | No Anesthesia (n = 700) | Anesthesia (n = 350) | P |
|---|---|---|---|
| Gender, n (%) | 1.000 | ||
| Male | 478 (68) | 239 (68) | |
| Female | 222 (32) | 111 (32) | |
| Birth weight, n (%) | 3417.5 ± 622.5 | 3395.5 ± 690.4 | .603 |
| <2500 g | 60 (9) | 30 (9) | |
| ≥2500 g | 640 (91) | 320 (91) | |
| Gestational age, n (%) | 39.8 ± 2.3 | 39.7 ± 2.7 | .488 |
| <32 wk | 10 (1) | 14 (4) | |
| 32–36 wk | 49 (7) | 16 (5) | |
| ≥37 wk | 641 (92) | 320 (91) | |
| Mother's education, n (%) | 1.000 | ||
| <12 y | 38 (5) | 19 (5) | |
| 12 y | 244 (35) | 122 (35) | |
| >12 y | 418 (60) | 209 (60) | |
| ASA-PS at age 5, n (%) | <.001 | ||
| 1 | 646 (92) | 284 (81) | |
| 2 | 51 (7) | 55 (16) | |
| 3 | 3 (0) | 11 (3) |
By design, exposed and unexposed groups were matched on gender, birth weight, gestational age, and mother's education.