OR (95% CI) for the risk of osteoporosis by quartiles of serum Vit B6 concentrations in women
| Model 1 | Model 2 | Model 3 | Model 4 | |
| p 1 for linear trend | 0.88 | 0.82 | 0.28 | 0.67 |
| Quartiles of Vit B6, μg/L | ||||
| p 2 for linear trend across quartiles | ||||
| First quartile (<19.2) (n=175) | 1.77 (1.14 to 2.07)* | 1.61 (1.00 to 2.58)* | 1.35 (0.83 to 2.22) | 1.54 (0.95 to 2.49) |
| Second quartile (19.2 to 22.8) (n=171) | 1.55 (0.99 to 2.41) | 1.46 (0.90 to 2.36) | 1.27 (0.78 to 2.08) | 1.42 (0.88 to 2.23) |
| Third quartile (22.8 to 26.9) (n=166) | 1.33 (0.85 to 2.07) | 1.38 (0.85 to 2.22) | 1.23 (0.75 to 2.00) | 1.35 (0.83 to 2.18) |
| Fourth quartile (>26.9) (n=150) | 1 | 1 | 1 | 1 |
p 1, linear regression based on serum Vit B6 values and ranks of lumbar bone mass (rank 0, normal; rank 1, osteopenia; rank 2, osteoporosis); p 2, OR (95% CI) test of linear trend based on logistic regression values of the Vit B6 quartiles and ranks of osteoporosis (rank 0, normal; rank 1, osteoporosis).
Model 1, unadjusted; model 2, multivariate adjustment by BMI and age; model 3, multivariate adjustment by BMI, age and 25(OH)D; model 4, multivariate adjustment by BMI, age and PTH.
*P<0.05.
BMI, body mass index; Vit B6, vitamin B6.