Table 2.
Gestational weight gain according to initial BMI and comparison with the IOM recommendations.
| WHO BMI classification at first prenatal visit | BMI increase in gestation* | Weight gain in gestation* | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | % | mean | SD | % | mean | SD | IOM recommendation | % of extra IOM** | p-value | |||
| mean | SD | |||||||||||
| Low weight | 36 | 5.5 | 4.6 | 1.8 | 26.1 | 10.0 | 12.1 | 4.7 | 12.5 | 18.0 | 11.8 | 0.6324 |
| Adequate weight | 311 | 47.1 | 4.4 | 1.9 | 20.3 | 9.0 | 11.5 | 5.0 | 11.5 | 16.0 | 15.7 | 0.6695 |
| Overweight | 204 | 46.1 | 3.9 | 2.5 | 14.5 | 9.5 | 10.1 | 6.4 | 7.0 | 11.5 | 38.2 | < 0.0001 |
| Obesity | 110 | 16.6 | 2.7 | 2.2 | 8.2 | 6.5 | 7.2 | 5.8 | 5.0 | 9.0 | 33.7 | < 0.0001 |
*
The initial weight was considered the weight at the first prenatal care visit (max: 12 weeks).
**
Percentage of women with weight gain greater than the IOM recommendation, according to the original BMI classification.
WHO = World Health Organization.
BMI = body mass index.
SD = standard deviation.
IOM = Institute of Medicine.
p-value = T test of mean weight gain during gestation and respective mean of IOM recommendation.