Table 1 Definition of operational variables

Age

Adolescent (<20 years) versus adult deliveries (≥20 years)

Adolescents

Early adolescence (10–16 years) versus late adolescence (17–19 years) [6].

Gravidity

1. Primigravida (Women at their first pregnancy)

2. Multigravida (2–4 pregnancies)

3. Grand multigravida (>4 pregnancies)

Parity

1. Primiparous (Women at their first delivery)

2. Multiparous (2–4 deliveries)

3. Grand multiparous (>4 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)

Low birthweight

Babies born with a weight ≤ 2600 g [28].

High birthweight

Babies born with a weight ≥ 3850 [29].