1. None Low Moderate High Very High (>0 to 3) (>3 to 20) (>20 to 50) (>50) Annual Effective Dose (mSv per year)

2. Overall Study Population No. Subjects With ≥1 Imaging Procedures Using Ionizing Radiation No. (%) Annual Effective Radiation Dose from Medical Imaging Procedures (mSv) Mean (±SD)Median (IQR) All subjects952420655613(68.8)2.4(±6.0)0.1(0.0 - 1.7) Age groups 18-34233586115696(49.5)1.0(±3.5)0.0(0.0 - 0.4) 35-3911836577746(65.7)1.6(±4.5)0.1(0.0 - 0.8) 40-44144728104398(72.1)2.0(±5.1)0.2(0.0 - 1.2) 45-49146703109827(74.9)2.6(±6.0)0.3(0.0 - 2.3) 50-54131209102559(78.2)3.3(±6.9)0.4(0.0 - 4.7) 55-5911552091870(79.5)4.1(±7.9)0.5(0.0 - 5.3) 60-646230953517(85.9)5.2(±9.1)0.9(0.1 - 6.4) Gender Men453078262552(57.9)2.3(±6.1)0.0(0.0 - 1.2) Women499342393061(78.7)2.6(±5.9)0.3(0.0 - 2.2)

3. Low ≤3 mSv/year Moderate >3 to 20 mSv/year High >20 to 50 mSv/year Very-High >50 mSv/year All individuals785.7193.818.61.9 Age groups 18-34895.998.74.90.5 35-39845.5145.28.50.8 40-44809.3177.512.01.2 45-49770.4209.218.42.0 50-54719.0252.226.22.7 55-59668.4289.738.43.5 60-64598.2343.452.75.7 Gender Men796.0182.819.41.8 Women776.4203.817.91.9 Annual Rates of Low, Moderate, High, and Very-High Radiation Exposures per 1000

4. ProcedureDose (mSv) Annual Dose /person Proportion of Overall Radiation 1. Myocardial perfusion imaging15.60.54022.1% 2. CT of the abdomen80.44618.3% 3. CT of the pelvis60.29712.2% 4. CT of the chest70.1847.5% 5. Diagnostic cardiac catheterization70.1134.6% 6. X-ray of the lumbar spine1.50.0803.3% 7. Mammography0.40.0763.1% 8. CT angio of the chest (non-coronary)150.0753.1% 9. Upper GI series60.0582.4% 10. CT of the head/brain20.0492.0% 11. Percutaneous coronary intervention150.0431.8% 12. Bone scan (nuclear)6.30.0351.4% 13. X-ray of the abdomen0.70.0281.1% 14. CT of the cervical spine60.0200.8% 15. CT of the lumbar spine60.0180.7% 16. Chest x-ray0.020.0160.7% 17. Thyroid uptake scan1.90.0160.7% 18. Intravenous urography30.0140.6% 19. CT of the neck30.0140.6% 20. Cardiac resting ventriculography7.80.0140.6%

5. Distribution of Total Radiation Exposure by the Type of Imaging Procedure

6. Distribution of Total Radiation Exposure by Anatomic Site of the Imaging Procedure

7. Distribution of Total Radiation Exposure by Location of Service of the Imaging Procedure