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