Table 3. Logistic regression analysis of body composition levels during early pregnancy and postpartum weight retention.
| Quartiles of body composition level | ||||||
|---|---|---|---|---|---|---|
| Variables | Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | P for trend | Per 1 SD increase |
| PBF, % | <21.80 | 21.80–25.36 | 25.36–28.90 | >28.90 | ||
| N (case/total) | 76/170 | 64/167 | 54/168 | 35/168 | ||
| Model 1 | Ref. | 0.77 (0.50 to 1.19) | 0.59 (0.38 to 0.91) | 0.33 (0.20 to 0.52) | 0.168 | 0.63 (0.53 to 0.74) |
| Model 2 | Ref. | 1.01 (0.62 to 1.65) | 0.69 (0.41 to 1.17) | 0.49 (0.24 to 0.99) | 0.638 | 0.71 (0.55 to 0.91) |
| FM, kg | <10.60 | 10.60–14.05 | 14.05–17.10 | >17.10 | ||
| N (case/total) | 78/169 | 67/168 | 50/168 | 34/168 | ||
| Model 1 | Ref. | 0.77 (0.50 to 1.19) | 0.49 (0.31 to 0.77) | 0.30 (0.18 to 0.48) | 0.318 | 0.59 (0.49 to 0.71) |
| Model 2 | Ref. | 0.96 (0.58 to 1.58) | 0.70 (0.41 to 1.18) | 0.36 (0.17 to 0.76) | 0.757 | 0.65 (0.50 to 0.85) |
| FFM, kg | <37.90 | 37.90–40.33 | 40.33–42.40 | >42.40 | ||
| N (case/total) | 71/177 | 76/168 | 41/160 | 41/168 | ||
| Model 1 | Ref. | 1.23 (0.80 to 1.89) | 0.51 (0.32 to 0.82) | 0.48 (0.30 to 0.76) | 0.009 | 0.68 (0.57 to 0.81) |
| Model 2 | Ref. | 1.15 (0.72 to 1.82) | 0.70 (0.43 to 1.14) | 0.73 (0.42 to 1.25) | 0.364 | 0.82 (0.67 to 1.00) |
| LM, kg | <34.30 | 34.30–37.04 | 37.04–39.60 | >39.60 | ||
| N (case/total) | 79/177 | 61/167 | 48/162 | 41/167 | ||
| Model 1 | Ref. | 0.71 (0.46 to 1.10) | 0.52 (0.33 to 0.82) | 0.40 (0.25 to 0.64) | 0.154 | 0.70 (0.59 to 0.83) |
| Model 2 | Ref. | 0.77 (0.48 to 1.22) | 0.74 (0.45 to 1.21) | 0.61 (0.35 to 1.07) | 0.311 | 0.87 (0.71 to 1.06) |
Data are presented as ORs with corresponding 95% CIs. ‘P for trend’ is the trend effect value obtained by including body composition quartiles as ordinal variables in the regression model. ‘Per 1 SD increase’ represents the effect value of postpartum weight retention risk corresponding to each SD increase in body composition.
Model 1: without adjustment.
Model 2: adjusted for early pregnancy BMI, maternal age, ethnicity, household registration type, education level, gravidity, parity, GWG.
Bold values represent statistical significance (P<0.05).
BMI, body mass index; FFM, fat-free mass; FM, fat mass; GWG, gestational weight gain; LM, lean mass; PBF, percentage of body fat.