Distribution of the anthropometric measures for each prenatal visit and differences along the gestation
| Characteristics | 19–21 (weeks) | 27–29 (weeks) | First to second visit | 37–39 (weeks) | Third to first visit |
| P value* | P value* | ||||
| BMI (kg/m²) | |||||
| Mean ± SD | 26.33±5.36 | 27.96±5.36 | <0.0001 | 29.93±5.34 | <0.0001 |
| 25th Percentile | 22.50 | 24.20 | 26.30 | ||
| 50th Percentile | 25.40 | 27.00 | 29.00 | ||
| 75th Percentile | 29.20 | 30.70 | 32.60 | ||
| Total (n) | 1165 | 1078 | 772 | ||
| Categories n (%) | |||||
| Underweight | 206 (18) | 136 (13) | <0.0001 | 98 (13) | 0.0002 |
| Adequate | 461 (40) | 363 (34) | 275 (36) | ||
| Overweight | 299 (26) | 392 (36) | 219 (28) | ||
| Obese | 199 (17) | 187 (17) | 180 (23) | ||
| MUAC (cm) | |||||
| Mean±SD | 28.71±4.64 | 29.32±4.54 | <0.0001 | 29.66±4.35 | <0.0001 |
| 25th Percentile | 25.20 | 26.00 | 26.50 | ||
| 50th Percentile | 28.00 | 28.90 | 29.00 | ||
| 75th Percentile | 31.50 | 32.00 | 32.00 | ||
| Total (n) | 1139 | 934 | 770 | ||
| Weight (kg) | |||||
| Mean±SD | 67.95±14.69 | 72.43±14.64 | <0.0001 | 77.65±14.75 | <0.0001 |
| 25th Percentile | 57.60 | 62.33 | 67.50 | ||
| 50th Percentile | 65.40 | 70.00 | 75.10 | ||
| 75th Percentile | 75.70 | 80.08 | 85.88 | ||
| Total (n) | 1165 | 936 | 772 |
*ANOVA test for repeated measures. χ2 test for BMI categories. From the 3015 MUAC measures, 8 values were considered a deviation for those seen at the second visit, the mean of the two closest measures recorded was used.
ANOVA, analysis of variance; BMI, body mass index; MUAC, midupper arm circumference.