From: Prevalence and risk factors related to preterm birth in Brazil
Model A | Model B | Model C | |||||||
---|---|---|---|---|---|---|---|---|---|
OR adj.g (95 % CI) | OR adj.h (95 % CI) | OR adj.i (95 % CI) | |||||||
Level 1 - Sociodemographic characteristics | |||||||||
Childbirth healthcare (ref: public) | |||||||||
Private | 1.36* | 0.98 | 1.87 | 1.40* | 1.07 | 1.85 | 1.47 | 1.09 | 1.97 |
Age (ref: 20 to 34) | |||||||||
12 to 19 | 0.88 | 0.69 | 1.12 | 0.73 | 0.55 | 0.95 | 0.93 | 0.68 | 1.20 |
≥ 35 | 1.60* | 1.27 | 2.02 | 1.65* | 1.30 | 2.08 | 1.27 | 1.01 | 1.59 |
Skin color (ref: white) | |||||||||
Black | 0.82 | 0.58 | 1.16 | ||||||
brown | 1.01 | 0.84 | 1.22 | ||||||
Marital status (ref:live with partner) | |||||||||
Do not live with partner | 0.85 | 0.67 | 1.09 | ||||||
Years of schooling (ref: ≥ 15) | |||||||||
≤ 7 | 0.74 | 0.47 | 1.17 | ||||||
8 to 10 | 0.74 | 0.46 | 1.19 | ||||||
11 to 14 | 0.91 | 0.60 | 1.37 | ||||||
Level 2 - Obstetric history | |||||||||
Previous births (ref: 1 to 2) a | |||||||||
0 | 1.40* | 1.16 | 1.70 | 1.26 | 1.04 | 1.53 | |||
≥ 3 | 1.23* | 0.94 | 1.61 | 1.16 | 0.89 | 1.52 | |||
Previous abortionb (ref: no, in women with a previous pregnancy) | 1.14 | 0.84 | 1.53 | ||||||
Previous stillbirth or neonatal deathc (ref: no, in women with a previous delivery) | 1.39* | 0.93 | 2.09 | ||||||
Previous preterm birthc (ref: no, in women with a previous delivery) | 2.84* | 2.18 | 3.70 | 3.14 | 2.39 | 4.11 | |||
Previous caesarean sectionc (ref: no, in women with a previous delivery) | |||||||||
1 | 1.41* | 1.06 | 1.87 | 1.25 | 0.96 | 1.62 | |||
≥ 2 | 1.91* | 1.43 | 2.55 | 1.64 | 1.19 | 2.26 | |||
Level 3 - Maternal/fetal conditions during pregnancy | |||||||||
Type of pregnancy (ref: single) | |||||||||
Multiple | 20.29 | 12.58 | 32.72 | ||||||
Obstetric risk (ref: no) | |||||||||
Any below | 6.84 | 5.56 | 8.42 | ||||||
Hypertensive disordersd | 6.35 | 4.97 | 8.12 | ||||||
Eclampsia | 8.67 | 5.24 | 14.35 | ||||||
Preexisting Diabetes | 3.60 | 2.19 | 5.91 | ||||||
Gestational Diabetes | 2.04 | 1.58 | 2.63 | ||||||
Severe chronic diseasese | 3.30 | 1.80 | 6.05 | ||||||
Infection at hospital admission for birth | 5.12 | 1.76 | 14.89 | ||||||
Abruptio placentae | 7.84 | 5.04 | 12.21 | ||||||
Placental praevia | 6.44 | 3.48 | 11.90 | ||||||
IUGR | 5.18 | 3.93 | 6.83 | ||||||
Major newborn malformationf | 5.55 | 2.00 | 15.39 |