Estimates of differences in pQCT parameters at the radius and tibia by HIV status. Model 1 adjusted for age (yr) and menopause status (category); model 2 adjusted for age (yr) and menopause status (category), and height (m); and model 3 adjusted for age (yr) and menopause status (category), height (m), and fat mass (g). Abbreviations: vBMD, volumetric BMD; CSA, cross-sectional area; BSIc, bone strength index of compression; SSI, stress–strain index.