Skip to main content

Table 3 Contingency tables for the classification of body mass index (BMI) using self-reported and first trimester weight in the Brazilian Maternal and Child Nutrition Consortium (BMCNC)

From: Agreement between self-reported pre-pregnancy weight and measured first-trimester weight in Brazilian women

Self-reported pre-pregnancy weight

First trimester weight

Underweight

Normal

Overweight

Obesity

Total

30–94 days

 Underweight

167 (3.1)

121 (2.2)

0

0

288 (5.3)

 Normal

41 (0.8)

2597 (48.3)

393 (7.3)

6 (0.1)

3037 (56.4)

 Overweight

0

103 (1.9)

1148 (21.3)

153 (2.8)

1404 (26.1)

 Obesity

0

0

41 (0.8)

611 (11.3)

652 (12.1)

 Total

208 (3.9)

2821 (52.4)

1583 (29.4)

770 (14.3)

5381 (100)

30–60 days

 Underweight

53 (3.3)

29 (1.8)

0

0

82 (5.1)

 Normal

7 (0.4)

792 (49.0)

107 (6.6)

1 (0.06)

907 (56.1)

 Overweight

0

27 (1.7)

361 (22.3)

40 (2.5)

428 (26.5)

 Obesity

0

0

7 (0.4)

193 (11.9)

200 (12.4)

 Total

60 (3.7)

848 (52.4)

475 (29.4)

234 (14.5)

1617 (100)

30–45 days

 Underweight

14 (2.9)

4 (0.8)

0

0

18 (3.7)

 Normal

3 (0.6)

225 (46.9)

34 (7.1)

1 (0.2)

263 (54.8)

 Overweight

0

4 (0.8)

116 (24.2)

13 (2.7)

133 (27.7)

 Obesity

0

0

0

66 (13.7)

66 (13.7)

 Total

17 (3.5)

233 (48.5)

150 (31.2)

80 (16.7)

480 (100)

  1. Note: Values refer to absolute and relative frequencies in each cell. BMI cutoffs: Underweight, BMI < 18.5 kg/m2; Normal, BMI ≥ 18.5 and < 25.0 kg/m2; Overweight, BMI ≥ 25.0 and < 30.0 kg/m2 and Obesity, BMI ≥ 30.0 kg/m2