Table 3

Non-linearity addressing by weighted two-piecewise linear model in women

Dietary magnesium intake (log2 transform)
OR (95% CI)P value
Fitting by standard linear model0.9 (0.8 to 1.0)0.011*
Fitting by two-piecewise linear model
 <7.50.7 (0.5 to 0.8)<0.001***
 7.5–8.81.0 (0.7 to 1.2)0.700
 >8.82.8 (1.2 to 6.6)0.020*
Log likelihood ratio<0.001***

  • OR has been adjusted for all covariates listed in table 1.

  • *p<0.05; ***p<0.001, significantly associated with prevalence of RA in women.

  • RA, rheumatoid arthritis.