Mean birth weight (SD), proportion of low birth weight (1000 g–2500 g), adjusted odds ratios (OR) and 95% confidence intervals (95% CI) for low birth weight, for all singleton full term live births in São Paulo, Brazil, 1997
| Number | Missing (%) | Mean (SD) | LBW (%) | OR* (95% CI) | |
|---|---|---|---|---|---|
| LBW, low birth weight; *OR adjusted for all variables in the table. | |||||
| All live births | 179460 | 3186 (464) | 5.0 | – | |
| Male | 91793 | 29 | 3244 (472) | 4.4 | 1.0 |
| Female | 87638 | (0.02%) | 3125 (448) | 5.7 | 1.36 (1.28 to 1.44) |
| Gestastional week | |||||
| 37–41 | 176991 | 3185 (464) | 5.1 | 1.79 (1.30 to 2.46) | |
| 42+ | 2469 | 3266 (495) | 3.9 | 1.0 | |
| Maternal age (y) | |||||
| under 19 | 30112 | 3125 (449) | 6.0 | 1.07 (0.98 to 1.18) | |
| 20–24 | 51729 | 3175 (450) | 4.9 | 0.94 (0.86 to 1.02) | |
| 25–29 | 47462 | 231 | 3212 (461) | 4.4 | 1 |
| 30–34 | 32789 | (0.13%) | 3217 (476) | 4.6 | 1.17 (1.06 to 1.28) |
| 35–39 | 13979 | 3192 (502) | 5.9 | 1.40 (1.25 to 1.58) | |
| 40+ | 3158 | 3182 (525) | 7.0 | 1.54 (1.25 to 1.91) | |
| Maternal education | |||||
| none | 2589 | 3172 (511) | 6.9 | 1.86 (1.50 to 2.32) | |
| 1–4 | 67652 | 3183 (473) | 5.4 | 1.42 (1.25 to 1.62) | |
| 4–8 | 34081 | 30856 | 3181 (468) | 5.4 | 1.50 (1.32 to 1.72) |
| 8–11 | 29541 | (17.2%) | 3194 (449) | 4.3 | 1.32 (1.15 to 1.51) |
| 12+ | 14741 | 3202 (429) | 3.3 | 1.0 | |
| Antenatal care (visits) | |||||
| none | 3917 | 3064 (493) | 9.9 | 2.36 (2.08 to 2.68) | |
| 1 to 6 | 49145 | 59119 | 3176 (471) | 5.5 | 1.25 (1.17 to 1.33) |
| 6+ | 67279 | (32.9%) | 3205 (452) | 4.2 | 1.0 |
| First parity | 53318 | 53018 | 3153 (452) | 5.4 | 1.32 (1.23 to 1.41) |
| Second or more | 73124 | (29.5%) | 3215 (474) | 4.8 | 1.0 |
| Normal delivery | 85310 | 878 | 3142 (455) | 5.8 | 1.28 (1.20 to 1.36) |
| Caesarean+forceps | 93272 | (0.5%) | 3225 (469) | 4.3 | 1.0 |