Table 2. Categorization of variables, Teresina, Piauí, Brazil.

Variable	Categories	Categorization
Mother race	White Non-white	White Brown, black, yellow
Mother marital status	With partner No partner	Married, stable relationship Single, widow, legally separated
Mother age	10–19 years 20–34 years ≥ 35 years	10–19 years 20–34 years Higher and equal to 35 years
Mother education	Low Intermediate High	Adjustment between mother's age and education expected for each age group
Mother occupation	With remuneration No remuneration	With remuneration No remuneration
Hospital type	SUS Non-SUS	SUS Non-SUS
Parity	First time Multiparous	No live birth or still birth in previous pregnancies With one or more live births or still births from previous pregnancies
Pregnancy type	Single Multiple	Single Double, triple or more
Delivery type	Vaginal Cesarean	Vaginal Cesarean
Prenatal	Did not perform Inappropriate Appropriate	Correspondence between the number of prenatal visits and gestational age
Gender	Female Male	Female Male
Gestational age	Preterm Term Post-term	Less than or equal to 36 weeks of pregnancy 37–41 weeks of pregnancy Greater than or equal to 42 weeks of pregnancy
Weight	Low weight Normal	Less than or equal to 2499 g Greater than or equal to 2500 g
Apgar 1st min	0–3 4–6 7–10	Severe asphyxia Moderate asphyxia No asphyxia
Apgar 5th min	0–3 4–6 7–10	Severe asphyxia Moderate asphyxia No asphyxia
Congenital malformation	Yes No	Presence of congenital malformation Absence of congenital malformation

Abbreviations: SUS, Brazilian Unified Health Care System; min, minute.

Source: Santos et al.11