Table 4

Utilization of radiology modalities per 1,000 person-years stratified by major diseases
Modality No major diseases Major diseases
Physicians General adults Rate ratio 95% CI P value Physicians General adults Rate ratio 95% CI P value
n=1,636 n=1,640 n=50 n=46
X-ray 359 549 0.65 0.63–0.67 <0.001 1042 1330 0.78 0.70–0.87 <0.001
Sonography 138 148 0.93 0.88–0.98 0.009 432 435 0.99 0.83–1.19 0.94
Computed tomography 21 17 1.23 1.06–1.43 0.004 178 169 1.06 0.79–1.41 0.69
Magnetic resonance imaging 29 14 2.07 1.65–2.60 <0.001 124 39 3.17 1.47–7.57 0.001
Radioisotope scanning 9 7 1.30 0.91–1.87 0.14 56 126 0.44 0.22–0.87 0.01
Positron emission tomography 0.12 0 NA NA NA 28 17 1.65 0.41–7.50 0.47
Interventional procedures 11 16 0.69 0.58–0.82 <0.001 37 60 0.61 0.34–1.08 0.08

NA: not analyzed because no patients in the control received positron emission tomography; 95% CI: 95% confidence interval.

Wu et al.

Wu et al. BMC Health Services Research 2013 13:284   doi:10.1186/1472-6963-13-284

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