Table 1.

Definition of operational variables

Gravidity	1. Primigravida (Women at their first pregnancy)
	2. Multigravida (2–4 pregnancies)
	3. Grand multigravida (> 4 pregnancies)
Parity	1. Primiparous (Women who had one previous term delivery)
	2. Multiparous (2–4 previous term deliveries)
	3. Grand multiparous (> 4 previous term deliveries)
Gestational age	1. Preterm delivery: Delivery from 28 to 36 weeks of gestation
	2. Term delivery: Delivery from 37 to 42 weeks of gestation
	3. Post-term delivery: Delivery above 42 weeks of gestation
Apgar score at fifth minute	Neonatal asphyxia. Yes (<  7) versus No (≥  7)