Table 4.
Linear regression models of change in maternal body composition from 14 to 37 weeks gestation by trimester GWG1
| Fat Δ, kg n=152 |
TBW Δ, L n=156 |
||||||
|---|---|---|---|---|---|---|---|
| Coef. | 95% Confidence Interval |
p-value | Coef. | 95% Confidence Interval |
p-value | ||
| Weight gain, kg | |||||||
| Initial value2 | −0.09 | (−0.20, 0.03) | 0.14 | −0.20 | (−0.32, −0.08) | 0.002 | |
| Prepregnancy BMI | −0.06 | (−0.29, 0.17) | 0.63 | 0.23 | (0.11, 0.35) | <0.001 | |
| Trimester 2 Medium | 2.72 | (1.36, 4.08) | <0.001 | 1.37 | (0.19, 2.54) | 0.02 | |
| Trimester 2 High | 5.56 | (3.95, 717) | <0.001 | 1.23 | (−0.18, 2.64) | 0.09 | |
| Trimester 3 Medium | 1.97 | (0.66, 3.29) | 0.003 | 0.78 | (−0.35, 1.91) | 0.17 | |
| Trimester 3 High | 4.55 | (2.76, 6.34) | <0.001 | 1.85 | (0.30, 3.40) | 0.02 | |
| Rate of weight gain, kg/wk | |||||||
| Initial value2 | −0.05 | (−0.16, 0.06) | 0.37 | −0.21 | (−0.33, −0.08) | 0.001 | |
| Prepregnancy BMI | −0.12 | (−0.34, 0.10) | 0.30 | 0.22 | (0.10, 0.34) | <0.001 | |
| Trimester 2 Medium | 2.86 | (1.56, 4.17) | <0.001 | 0.79 | (−0.40, 1.99) | 0.19 | |
| Trimester 2 High | 5.29 | (3.99, 6.58) | <0.001 | 0.56 | (−0.66, 1.77) | 0.37 | |
| Trimester 3 Medium | 1.00 | (−0.22, 2.23) | 0.11 | 0.68 | (−0.45, 1.80) | 0.24 | |
| Trimester 3 High | 3.63 | (2.27, 5.00) | <0.001 | 1.75 | (0.49, 3.02) | 0.01 | |
1
Low tertile is reference for each trimester.
2
Initial value refers to initial body fat (kg) or TBW (L) measure. Models adjusted for gestational age at delivery, maternal education, race/ethnicity, age, parity and infant sex.
BMI, body mass index; GWG, gestational weight gain; TBW, total body water.