Table 3

Multiple linear regression analysis of BMD (g/cm²) at different sites of measurement (dependent variable), demographic and disease variables (independent variables)

	Femoral neck			Spine L1–4
	β	SE	95% CI	β	SE	95% CI
BMD, bone mineral density; SE, standard error; CI, confidence interval; BMI, body mass index; R², percentage of total variance explained in the model. Numbers needed for regression equation: original study: 1 = remission cohort, 2 = RAPIT trial; sex: 0 = women, 1 = men; corticosteroid use: 0 = never, 1 = ever. §P<0.05; ‡P<0.01.
Original study	−0.061	0.017	−0.095 to −0.027‡	−0.007	0.021	−0.049 to 0.035
Sex	−0.18	0.084	−0.34 to −0.016§	−0.41	0.10	−0.61 to −0.21‡
Age (years)	−0.005	0.001	−0.006 to −0.004‡	−0.006	0.001	−0.007 to −0.004‡
Interaction (age × sex)	0.004	0.001	0.001 to 0.007‡	0.008	0.002	0.005 to 0.012‡
BMI (kg/m²)	0.006	0.001	0.004 to 0.009‡	0.005	0.002	0.002 to 0.009‡
Corticosteroid use	−0.028	0.023	−0.062 to 0.007	−0.038	0.021	−0.080 to 0.005
Larsen score: hands and feet	−0.0004	<0.001	−0.001 to 0.000‡	−0.0002	<0.001	−0.001 to 0.000
R²			22			17