From: Prevalence and risk factors related to preterm birth in Brazil
Model A | Model B | Model C | |||||||
---|---|---|---|---|---|---|---|---|---|
OR adj.d (95 % CI) | OR adj.e (95 % CI) | OR adj.f (95 % CI) | |||||||
Level 1 - Sociodemographic characteristics | |||||||||
Childbirth healthcare (ref: public) | |||||||||
Private | 0.82 | 0.47 | 1.42 | ||||||
Age (ref: 20 to 34) | |||||||||
12 to 19 | 1.52* | 1.29 | 1.80 | 1.41* | 1.12 | 1.77 | 1.37 | 1.10 | 1.71 |
≥ 35 | 1.10 | 0.85 | 1.43 | 1.13 | 0.88 | 1.45 | 1.06 | 0.83 | 1.36 |
Skin color (ref: white) | |||||||||
Black | 1.02 | 0.78 | 1.33 | ||||||
brown | 1.03 | 0.81 | 1.33 | ||||||
Marital status (ref: live with partner) | |||||||||
Do not live with partner | 0.93 | 0.77 | 1.12 | ||||||
Years of schooling (ref: ≥ 15) | |||||||||
≤ 7 | 1.49* | 0.95 | 2.33 | 1.67* | 1.16 | 2.42 | 1.73 | 1.16 | 2.57 |
8 to 10 | 1.31 | 0.83 | 2.06 | 1.45* | 1.03 | 2.04 | 1.50 | 1.05 | 2.14 |
11 to 14 | 1.17 | 0.75 | 1.80 | 1.24 | 0.88 | 1.74 | 1.29 | 0.92 | 1.81 |
Level 2 - Obstetric history | |||||||||
Previous births (ref: 1 to 2) a | |||||||||
0 | 1.29* | 1.06 | 1.57 | 1.37 | 1.15 | 1.65 | |||
≥ 3 | 1.25* | 0.99 | 1.59 | 1.21 | 0.95 | 1.54 | |||
Previous abortionb (ref: no, in women with a previous pregnancy) | 0.99 | 0.80 | 1.23 | ||||||
Previous stillbirth or neonatal deathc (ref: no, in women with a previous delivery) | 1.05 | 0.76 | 1.45 | ||||||
Previous preterm birthc (ref: no, in women with a previous delivery) | 3.42* | 2.70 | 4.32 | 3.74 | 2.92 | 4.79 | |||
Previous caesarean sectionc (ref: no, in women with a previous delivery) | |||||||||
1 | 0.59* | 0.46 | 0.76 | 0.61 | 0.47 | 0.78 | |||
≥ 2 | 0.51* | 0.35 | 0.74 | 0.47 | 0.31 | 0.71 | |||
Level 3 - Maternal/fetal conditions during pregnancy | |||||||||
Adequacy of antenatal care (ref: adequate) | |||||||||
Inadequate or partially adequate | 1.29 | 1.09 | 1.52 | ||||||
Type of pregnancy (ref: single) | |||||||||
Multiple | 16.42 | 10.56 | 25.53 | ||||||
Obstetric risk (ref: no) | |||||||||
Infection at hospital admission for birth | 4.89 | 1.72 | 13.88 | ||||||
Abruptio placentae | 2.38 | 1.27 | 4.47 |