Table 2.

Percentage of inappropriate imaging requests in men and women, stratified by age group and exam modality (CT, MR, XR, US)

Subgroup variable	Subgroup level	% Inappropriate exam (women)	% Inappropriate exam (men)	p-value		OR (women vs. men) [99% CI]
Overall study	Overall	↑7.32%	6.08%	< 0.001*		1.22 [1.12–1.33]
Exam type	CT	6.13	↑6.79	0.030		0.90 [0.79–1.02]
	MR	↑6.02	4.3	< 0.001*		1.42 [1.18–1.73]
	XR	↑6.67	5.53	0.003		1.22 [1.02–1.45]
	US	↑16.36	14.16	0.112		1.19 [0.90–1.57]
Age group	< 25	↑10.28	7.87	0.107		1.34 [0.84–2.14]
	25–65	↑8.39	6.59	< 0.001*		1.30 [1.15–1.47]
	> 65	↑6.25	5.63	0.017		1.12 [0.99–1.26]

Asterisks indicate statistically significant differences at the adjusted alpha level of 0.0014 (p = 0.01/7). ↑ indicates the percentage of inappropriateness is highest for this sex

CT computed tomography, MR magnetic resonance imaging, XR X-ray, US ultrasound, OR odds ratio of inappropriate requests in women compared to men