Table II.

Significant maternal and neonatal outcomes by clinical subtypes

Maternal Characteristics (matched by maternal age)
PTB-M vs PTB-S (Reference: Subtype PTB-S)	OR	95% CI		P
Married	1.47	1.00	2.21	0.057*
Hypertensive disorders	2.17	1.01	5.16	0.048*
Preeclampsia	2.50	2.00	4.30	0.003*
Body weight gain (>13Kg)	1.50	1.00	2.25	0.047*
Less than 5 antenatal care visits (<5)	0.62	0.44	0.87	0.006*
PTB-PPROM vs PTB-I (Reference: Subtype PTB-I)	OR	95% CI		P
Use of corticosteroid	1.63	1.08	2.65	0.019*
Vaginal bleeding	1.79	1.21	2.67	0.004*
Infection during pregnancy	0.59	0.40	0.85	0.008*
Neonatal outcomes (matched by gestational age)
PTB-M vs PTB-S (Reference: Subtype PTB-S)	OR	95% CI		P
Very low birth-weight (<1500 gr)	2.95	1.82	4.78	<0.001**
Mechanical ventilation requirement	2.09	1.49	2.92	<0.001**
SGA (<p10)	2.11	1.63	2.73	<0.001**
Intracranial hemorrhage	0.55	0.36	0.80	0.004*
PTB-PPROM vs PTB-I (Reference: Subtype PTB-I)	OR	95% CI		P
Patent ductus arteriosus	2.26	1.20	4.35	0.011*
SGA (p<10)	0.75	0.56	0.99	0.047*

Note: PTB-S, spontaneous preterm birth; PTB-I, preterm labor leading to PTB (idiopathic); PTB-PPROM, premature rupture of membranes; PTB-M, medically indicated iatrogenic PTB.

Note:

^*P value < 0.05,

^**P value < 0.01