Linear associations between fat mass (%) and femoral neck BMD (g/cm2) for each category of smoking for all participants (n = 5094) in the Hordaland Health Study.

General linear regression models showing the regression coefficient between fat mass and BMD for each smoking category, and the differences in regression coefficients per % change in fat mass for each category, with never smokers as the reference group.Abbreviations: BMD, bone mineral density (g/cm2); B, Beta; CI, confidence interval.aNever smoking, plasma cotinine levels less than 85 nmol/L and no self-reported previous smoking; former smoking, self-reported previous smoking and plasma cotinine level >85 nmol/L; moderate smoking, plasma cotinine levels between 85 and 1199 nmol/L; heavy smoking, plasma cotinine levels ≥1200 nmol/L.