TABLE 2.
Maternal anthropometry, body composition, and plasma volume changes during pregnancy1
| 10 wk | 20 wk | 32 wk | Δ10–20 wk | Δ20–32 wk | |
| Gestational age at each visit, wk | 9.7 (7.9, 11.9) | 20.4 (20.0, 21.4) | 32.1 (31.7, 32.7) | ||
| Height, cm | 149 ± 5.3 | ||||
| BMI, kg/m2 | 19.0 (18.0, 20.8) | ||||
| Weight, kg | 43.1 ± 5.9 | 45.7 ± 5.5* | 48.9 ± 5.9* | 2.56 ± 2.00#x2020; | 3.19 ± 1.93*#x2020 |
| ECW, kg | 10.5 ± 1.0 | 10.9 ± 1.0* | 11.4 ± 1.1* | 0.44 ± 0.49#x2020; | 0.49 ± 0.57#x2020; |
| TBW, kg | 23.6 ± 2.3 | 24.5 ± 2.2* | 25.6 ± 2.5* | 0.90 ± 1.00#x2020; | 1.08 ± 1.12*#x2020 |
| ECW, % Δ | 4.36 ± 4.86#x2020; | 4.51 ± 5.28#x2020; | |||
| TBW, % Δ | 3.94 ± 4.34#x2020; | 4.48 ± 4.61#x2020; | |||
| Plasma volume, % Δ | 16.6 ± 15.4#x2020; | −4.1 ± 10.8*#x2020 | |||
| Hb, g/L | 119 ± 11 | 109 ± 11* | 112 ± 11* | −10.4 ± 11.0#x2020; | 2.9 ± 9.6*#x2020; |
| Hematocrit | 0.36 ± 0.030 | 0.33 ± 0.029* | 0.34 ± 0.033* | −0.034 ± 0.0284 | 0.015 ± 0.026*#x2020; |
| Systolic blood pressure, mm Hg | 108 ± 9.4 | 107 ± 9.1 | −0.97 ± 9.72 | ||
| Diastolic blood pressure, mm Hg | 65 ± 7.8 | 65 ± 9.5 | 0.38 ± 10.32 |
1
Values are mean ± SD or median (IQR), = 377, except values were missing for gestational age (n = 7), ECW and TBW at 10 wk (n = 1), plasma volume Δ10–20 wk (n = 12), plasma volume Δ20–32 wk (n = 16), Hb at 20 wk (n = 5) and 32 wk (n = 3), Hct at 10 wk (n = 4), 20 wk (n = 5), and 32 wk (n = 9). *Different from earlier visit or change (t test), P < 0.01; †different from 0 (t test), P < 0.01. ECW, extracellular water; Hb, hemoglobin; Hct, hematocrit; TBW, total body water.
2
Change from 10 to 32 wk.