Table 7. Multiple regression analysis to demonstrate the relationships between BMI, BMI associated factors, confounding variables and haemodilution on serum vitamin folate.
| Factors associated with serum folate* | Partial R | Beta | 95% CI | t | p |
|---|---|---|---|---|---|
| BMI (kg/m2)* | -0.06 | -0.26 | (-0.54, 0.02) | -1.80 | 0.07 |
| BMI associated factors | |||||
| - HOMAR | -0.05 | -0.07 | (-0.17, 0.03) | -1.45 | 0.2 |
| - Triglycerides (mmol/L) | 0.07 | 0.12 | (0.003, 0.239 | 2.01 | 0.05 |
| - HDL cholesterol | 0.07 | 0.09 | (0.009, 0.17) | 2.17 | 0.03 |
| - AST (mmol/L)* | 0.16 | 0.36 | (0.21, 0.51) | 4.7 | <0.001 |
| - FPG | 0.006 | 0.01 | (-0.10, 0.20) | 0.18 | 0.9 |
| Social/demographic | |||||
| - Age | 0.13 | 0.02 | (0.008, 0.02) | 3.82 | <0.001 |
| - Townsend score | -0.02 | -0.003 | (-0.02, 0.008) | -0.54 | 0.6 |
| - Smoking | -0.08 | -0.13 | (-0.25, -0.02) | -2.26 | 0.02 |
| - Vegetarianism | 0.18 | 0.36 | (0.23, 0.49) | 5.45 | <0.001 |
| - Vitamin use | 0.41 | 0.55 | (0.47, 0.63) | 13.30 | <0.001 |
| Pregnancy related | |||||
| - Parity | 0.09 | 0.11 | (0.031, 0.18) | 2.77 | 0.006 |
| Haemodilutional | |||||
| - Haematocrit (%) | 0.04 | 0.94 | (-0.49, 2.38) | 1.29 | 0.2 |
* Denotes variable transformed using natural logs (allowing β coefficients to be interpreted in terms of percentage change)