Table 1.
Description of the weight and body mass index (BMI) variables in the Brazilian Maternal and Child Nutrition Consortium (BMCNC) and in the Brazilian Food and Nutritional Surveillance System (SISVAN)
| BMCNC dataset | SISVAN dataset | |||
|---|---|---|---|---|
| Weight and BMI variables | Mean (SD) | Minimum; Maximum | Mean (SD) | Minimum; Maximum |
| 30–94 days | ||||
| Self-reported pre-pregnancy weight | 62.4 (13.0) | 30; 120 | 63.8 (13.6) | 33.0; 128.0 |
| First trimester weight | 64.0 (13.1) | 34.9; 116.8 | 65.0 (13.8) | 36.6; 121.5 |
| Difference between weightsa | 1.6 (3.8) | −21.1; 23.5 | 1.2 (2.8) | −8.7; 15.8 |
| Self-reported pre-pregnancy BMIb | 24.4 (4.6) | 12.9; 46.9 | 25.0 (5.0) | 12.6; 56.6 |
| First trimester BMIb | 25.1 (4.6) | 14.4; 45.8 | 25.4 (5.0) | 12.6; 56.9 |
| Difference between BMIa | 0.6 (1.48) | −7.1 – 8.7 | −0.5 (1.1) | − 0.9; 4.1 |
| 30–60 days | ||||
| Self-reported pre-pregnancy weight | 63.2 (12.9) | 30; 115 | 64.2 (13.5) | 33.0; 126.0 |
| First trimester weight | 64.6 (13.1) | 35.8; 113.8 | 65.3 (13.7) | 36.6; 120.0 |
| Difference between weightsa | 1.4 (3.5) | −21.1; 19.5 | 1.1 (2.6) | −8.7; 15.8 |
| Self-reported pre-pregnancy BMIb | 24.6 (4.6) | 13.9; 45.7 | 25.0 (4.9) | 12.6; 53.0 |
| First trimester BMIb | 25.1 (4.7) | 14.4; 45.8 | 25.4 (5.0) | 12.6; 53.3 |
| Difference between BMIa | 0.5 (1.3) | −7.1 – 8.0 | −0.4 (1.0) | −7.4; 4.1 |
| 30–45 days | ||||
| Self-reported pre-pregnancy weight | 64.2 (12.5) | 40; 112 | 64.6 (13.7) | 33.0; 124.0 |
| First trimester weight | 65.6 (12.5) | 36; 113.8 | 65.6 (13.7) | 36.6; 119.0 |
| Difference between weightsa | 1.4 (3.2) | −16.0; 18.0 | 1.0 (2.5) | −8.7; 15.8 |
| Self-reported pre-pregnancy BMIb | 24.9 (4.5) | 16.4; 40.4 | 25.1 (4.9) | 12.6; 53.0 |
| First trimester BMIb | 25.5 (4.5) | 16.0; 40.2 | 25.5 (5.0) | 12.6; 53.3 |
| Difference between BMIa | 0.6 (1.3) | −5.5 – 7.8 | −0.4 (1.0) | −7.4; 4.0 |
Notes: a Difference was calculated as: first trimester weight/BMI – self-reported weight/BMI. b There is a small difference in the sample size for the calculation of BMI due to missing data in height in the BMCNC dataset (n = 5381 for 30–94 days, n = 1617 for 30–60 days, n = 480 for 30–45 days). SISVAN Brazilian Food and Nutritional Surveillance System, BMCNC Brazilian Maternal and Child Nutrition Consortium, SD Standard deviation