P values (β coefficients) showing the significance for linear regression analysis are present. P for model <0.001. *P <0.05; **P < 0.01.
In Model 1, the unadjusted P value for the association between K6 score and energy-adjusted folate intake is shown. In Model 2, P value is adjusted for age and sex only. In model 3, adjust factors include age, sex, job stress scores and SES factors.