Table 1.
Characteristics of the female participants in the study.
Figure 1.
Distribution of vitamin B12 and folate by age among Chinese women in Shaanxi province.
Table 2.
The median and distribution of vitamin B12 and folate by the residence, geographical environment and age.
Figure 2.
Prevalence of deficiency in vitamin B12 and folate among Chinese women in Shaanxi province.
Figure 3.
The relationship between the vitamin B12 and folate among Chinese women in Shaanxi province.
Figure 4.
Quantile regression and ordinary least squares (OLS) estimates by residence (urban vs rural): folate deficiency and vitamin B12.
Circles represent quantile regression estimates, and the shaded areas around the quantile regression estimates were the 95% confidence intervals. The dashed line was OLS estimate, and the dash-dotted lines showed the OLS 95% confidence interval. Estimates shown here compared folate deficiency with no-deficiency.
Table 3.
Estimated coefficients from and multiple liner regression quantile regression for selected quantiles: vitamin B12 and folate status by residence.*