Explanatory Variables | Category | Case | Control |
Gestational Age | <37 weeks | 74 | 14 |
≥37 weeks | 57 | 251 | |
Twining | Twin | 23 | 9 |
Not twin | 108 | 254 | |
Congenital Anomalies | Present | 1 | 1 |
Absent | 130 | 262 | |
Placental Abnormality | Present | 0 | 0 |
Absent | 131 | 263 | |
Sex | Male | 68 | 159 |
Female | 63 | 105 | |
Birth Interval | <2 yrs | 43 | 71 |
≥2 yrs | 56 | 155 |