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| Variables | Cases (n = 90) | Controls (n = 180) |
|---|---|---|
| Number (%) | Number (%) | |
| Sex | ||
| Male | 60(66.7) | 87(48.3) |
| Female | 30(33.3) | 93(51.7) |
| Gestational age | ||
| Preterm | 16(17.8) | 11(6.2) |
| Term | 65(81.8) | 152(84.4) |
| Post-term | 9(10.0) | 17(9.4) |
| Birth weight, in milligram | ||
| <2500 | 22(24.4) | 9(5.0) |
| ≥2500 | 68(75.6) | 171(95.0) |
| Birth type | ||
| Singleton | 82(91.1) | 173(96.1) |
| Twin | 8(9.9) | 7(3.9) |
| Fetal heart rate, beat per minute | ||
| <100 | 32(35.6) | 9(5.0) |
| ≥100 | 58(64.4) | 171(95.0) |
