TABLE 4.
Pairwise comparison of Deming regression estimates between methods at 37 wk of gestation for maternal fat mass (kg)1
| Method | BIA | PP DXA | Db(BodPod) | Db(VRJ) | TBW(VRJ) | 3-C | 4-C |
| SFT (n = 41) | |||||||
| Intercept | 9.2 (5.6, 12.5) | 9.2 (5.8, 12.4) | 6.2 (3.6, 8.5) | 7.6 (5.3, 10.1) | 10.6 (4.3, 16.1) | 7.3 (1.9, 11.2) | 13.2 (9.4, 16.3) |
| Slope | 0.8 (0.8, 0.9) | 0.9 (0.8, 1.0) | 0.9 (0.8, 0.9) | 0.9 (0.8, 0.9) | 0.8 (0.7, 1.0) | 0.9 (0.8, 1.1) | 0.9 (0.8, 1.0) |
| BIA (n = 41) | |||||||
| Intercept | −0.03 (−6.2, 3.9) | −3.6 (−9.2, 0.8) | −1.9 (−7.4, 2.7) | −1.0 (−12.4, 5.4) | −4.1 (−14, 1.8) | 3.8 (−3.1, 8.4) | |
| Slope | 1.1 (1.0, 1.3) | 1.1 (1.0, 1.2) | 1.1 (1.0, 1.2) | 1.1 (0.9, 1.5) | 1.2 (1.0, 1.4) | 1.1 (1.0, 1.3) | |
| PP DXA (n = 38) | |||||||
| Intercept | −3.6 (−6.7, −0.8) | −2.0 (−5.0, 0.8) | −0.32 (−5.2, 4.5) | −2.0 (−5.2, 1.2) | 4.3 (2.0, 6.5) | ||
| Slope | 1.0 (0.1, 1.1) | 1.0 (0.9, 1.1) | 1.0 (0.9, 1.1) | 1.0 (0.9, 1.1) | 1.0 (0.9, 1.1) | ||
| Db(BodPod) (n = 41) | |||||||
| Intercept | 4.9 (−1.0, 11.0) | 4.9 (−1.0, 11.0) | 1.7 (−3.5, 5.0) | 8.5 (5.0, 11.2) | |||
| Slope | 1.0 (0.9, 1.2) | 1.0 (0.9, 1.2) | 1.0 (1.0, 1.2) | 1.0 (0.9, 1.1) | |||
| Db(VRJ) (n = 41) | |||||||
| Intercept | 3.5 (−3.7, 9.3) | 0.2 (−5.3, 3.7) | 6.9 (3.8, 9.6) | ||||
| Slope | 1.0 (0.8, 1.2) | 1.0 (0.9, 1.2) | 1.0 (0.9, 1.1) | ||||
| TBW(VRJ) (n = 34) | |||||||
| Intercept | −3.2 (−7.7, −1.6) | 4.7 (2.0, 7.0) | |||||
| Slope | 1.1 (1.0, 1.2) | 1.0 (1.0, 1.1) | |||||
| 3-C (n = 34) | |||||||
| Intercept | 6.2 (5.0, 7.0) | ||||||
| Slope | 1.0 (1.0, 1.0) |
1
All values are coefficients; 95% CIs in parentheses. BIA, bioelectrical impedance analysis; Db(BodPod), air displacement plethysmography body density; Db(VRJ), van Raaij body density; DXA, dual-energy X-ray absorptiometry; PP, postpartum; SFT, skinfold thickness; TBW(VRJ), van Raaij total body water; 3-C, 3-compartment; 4-C, 4-compartment.