Atypical Femoral Shaft Fractures in Female Bisphosphonate Users Were Associated with an Increased Anterolateral Femoral Bow and a Thicker Lateral Cortex: A Case-Control Study

Table 2

Odds ratios of each variable after adjusting for age and body mass index.

	value	OR	95% CI of OR
			Lower	Upper
Lateral (coronal) femoral bow	<0.0001	1.546	1.234	1.935
Anterior (sagittal) femoral bow	0.005	1.220	1.064	1.400
Total cortical thickness	0.002	1.411	1.131	1.759
Lateral cortical thickness	<0.0001	3.234	1.779	5.878
Medical cortical thickness	0.521	1.090	0.837	1.421
Lateral cortical thickness	<0.0001	1.526 × 10^14	3.005 × 10^6	7.746 × 10^21
Medical cortical thickness index	0.769	0.238	0.000	3376.113
Adjusted lateral cortical	<0.0001	4.187	2.018	8.688
Adjusted medial cortical	0.478	1.114	0.826	1.5032

OR for lateral cortical thickness index was caused by statistically significant difference of index between AFSF group and control group. Instead, we analyzed the OR between two groups by using adjusted cortical .
lateral and medial cortical thicknesses were calculated as the lateral and medial cortical thickness index multiplied by the mean femoral diameter of the AFSF group and the control group, respectively.
CI: confidence interval. OR: odds ratio.