Table 2.
Mean values for birthweight, gestational age, maternal age, and parity
| Cases | Controls | Standard error of difference of mean | |||
|---|---|---|---|---|---|
| SD | 95 % CI | P value | |||
| Birth weight in grams (mean ± SD) | 1806.45 ± 596.25 | 1755.17 ± 597.58 | 46.758 | −143.07 to 40.51 | 0.2731 |
| Gestational age in weeks (mean ± SD) | 33.55 ± 3.91 | 33.41 ± 3.92 | 0.307 | −0.742 to 0.462 | 0.6482 |
| Maternal age in years (mean ± SD) | 26.36 ± 5.06 | 23.43 ± 3.43 | 0.316 | −3.551 to −2.309 | <0.0001 |
| Parity (mean ± SD) | 2.17 ± 1.26 | 1.61 ± 0.88 | 0.0799 | −0.717 to −0.403 | <0.0001 |