Table 5 Multivariable analysis of risk factors for LBW, 1997/98 and 2010 São Luís birth cohorts
From: Low birth weight in São Luís, northeastern Brazil: trends and associated factors
1997/98 Cohort | 2010 Cohort | |||||
|---|---|---|---|---|---|---|
Variable | Odds ratio* | 95% Confidence interval | p* | Odds ratio* | 95% Confidence interval | p** |
Maternal age (years) | 0.082 | 0.142 | ||||
<18 | 1.51 | (0.99; 2.29) | 1.10 | (0.75; 1.59) | ||
18 – 19 | 0.78 | (0.49; 1.24) | 1.09 | (0.77; 1.55) | ||
20 – 34 | 1 | Reference | 1 | Reference | ||
≥35 | 1.19 | (0.52; 2.70) | 1.55 | (1.06; 2.27) | ||
Newborn’s sex | 0.686 | 0.017 | ||||
Male | 1 | Reference | 1 | Reference | ||
Female | 1.06 | (0.78; 1.44) | 1.29 | (1.04; 1.59) | ||
Family income | 0.107 | 0.119 | ||||
≤1 | 1.52 | (0.97; 2.37) | 1.41 | (0.99; 2.03) | ||
1- 3 | 1.21 | (0.83; 1.76) | 1.38 | (1.04; 1.84) | ||
>3 | 1 | Reference | 1 | Reference | ||
Missing | 1.82 | (1.03; 3.22) | 1.31 | (0.92; 1.84) | ||
Adequacy of prenatal care use | 0.455 | <0.001 | ||||
Adequate | 1 | Reference | 1 | Reference | ||
Inadequate | 0.76 | (0.53; 1.07) | 0.86 | (0.67; 1.10) | ||
No care | 0.98 | (0.55; 1.77) | 2.79 | (1.60; 4.86) | ||
Missing | 0.90 | (0.26; 3.10) | 0.78 | (0.46; 1.34) | ||
Maternal smoking during pregnancy | 0.007 | <0.001 | ||||
No | 1 | Reference | 1 | Reference | ||
Yes | 2.30 | (1.25; 4.23) | 2.51 | (1.63; 3.84) | ||
Parity | 0.003 | <0.001 | ||||
1 | 1.66 | (1.13; 2.43) | 1.57 | (1.20; 2.05) | ||
2 | 1 | Reference | 1 | Reference | ||
≥3 | 0.83 | (0.50; 1.38) | 1.10 | (0.53; 1.77) | ||
Category of delivery care | 0.050 | 0.916 | ||||
Private | 1 | Reference | 1 | Reference | ||
Public | 1.94 | (0.99; 3.78) | 0.97 | (0.58; 1.60) | ||
Type of delivery | 0.064 | 0.403 | ||||
Vaginal | 1 | Reference | 1 | Reference | ||
Cesarean | 1.38 | (0.98; 1.95) | 1.12 | (0.82; 1.53) | ||