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Table 2 Emergency Department CT use by Study Year and Demographics

From: Access to primary care and computed tomography use in the emergency department

  No CT Ordered During ED Visit (N = 497,894) CT Ordered During ED Visit (N = 98,001) Overall (N = 595,895) Odds of Receiving a CT (95% CI)
Age (years)
 Mean (SD) 39.5 (25.95) 52.6 (23.03) 41.6 (25.95)  
Age Group
  < 18 120,840 (95.2%) 6050 (4.8%) 126,890 (21.3%) ref.
 18–34 112,055 (85.4%) 19,105 (14.6%) 131,160 (22%) 3.41 (3.31, 3.51)
 35–49 85,501 (82%) 18,802 (18%) 104,303 (17.5%) 4.39 (4.26, 4.53)
 50–64 75,231 (79.2%) 19,741 (20.8%) 94,972 (15.9%) 5.24 (5.09, 5.40)
 65–79 63,687 (76.4%) 19,714 (23.6%) 83,401 (14%) 6.18 (6.00, 6.38)
  > 79 40,580 (73.6%) 14,589 (26.4%) 55,169 (9.3%) 7.18 (7.00, 7.41)
Patient gender
 F 257,526 (83.3%) 51,674 (16.7%) 309,200 (51.9%) ref.
 M 240,368 (83.8%) 46,327 (16.2%) 286,695 (48.1%) 0.96 (0.95, 0.97)
Year
 2003 47,397 (85.8%) 7844 (14.2%) 55,241 (9.3%) ref.
 2004 47,410 (84.6%) 8653 (15.4%) 56,063 (9.4%) 1.10 (1.07, 1.14)
 2005 53,593 (85.6%) 8980 (14.4%) 62,573 (10.5%) 1.01 (0.98, 1.05)
 2006 52,694 (83.6%) 10,342 (16.4%) 63,036 (10.6%) 1.19 (1.15, 1.22)
 2007 52,006 (83.6%) 10,176 (16.4%) 62,182 (10.4%) 1.18 (1.15, 1.22)
 2008 51,588 (82.7%) 10,818 (17.3%) 62,406 (10.5%) 1.27 (1.23, 1.31)
 2009 50,534 (82.3%) 10,832 (17.7%) 61,366 (10.3%) 1.30 (1.26, 1.34)
 2010 50,258 (82%) 11,010 (18.0%) 61,268 (10.3%) 1.32 (1.28, 1.37)
 2011 48,411 (82.3%) 10,382 (17.7%) 58,793 (9.9%) 1.30 (1.26, 1.34)
 2012 44,003 (83.1%) 8964 (16.9%) 52,967 (8.9%) 1.23 (1.19, 1.27)
Chronic Conditions
 Hypertension 39,825 (8.0%) 15,231 (15.5%) 55,056 (9.2%) 2.12 (2.07, 2.16)
 Cardiac Dysrhythmias 22,000 (4.4%) 6572 (6.7%) 28,572 (4.8%) 1.56 (1.51, 1.60)
 Asthma/COPD 22,101 (4.4%) 4550 (4.6%) 26,651 (4.5%) 1.05 (1.02, 1.08)
 Coronary Atherosclerosis 20,565 (4.1%) 5614 (5.7%) 26,179 (4.4%) 1.41 (1.37, 1.45)
 Depression 21,352 (4.3%) 3378 (3.4%) 24,730 (4.2%) 0.80 (0.77, 0.83)
 Diabetes 18,718 (3.8%) 5756 (5.9%) 24,474 (4.1%) 1.60 (1.55, 1.65)
 Hyperlipidemia 16,246 (3.3%) 5975 (6.1%) 22,221 (3.7%) 1.93 (1.87, 1.98)
 Malignancies 15,034 (3.0%) 6569 (6.7%) 21,603 (3.6%) 2.31 (2.24, 2.38)
 Congestive Heart Failure 12,154 (2.4%) 3000 (3.1%) 15,154 (2.5%) 1.26 (1.21, 1.31)
 Personality Disorders 10,846 (2.2%) 1527 (1.6%) 12,373 (2.1%) 0.71 (0.67, 0.75)
No. Chronic Conditions     
 None 343,771 (69.1%) 49,989 (51.0%) 393,760 (66.1%) ref.
 1–2 106,338 (21.4%) 31,191 (31.8%) 137,529 (23.1%) 2.02 (1.98, 2.05)
 3+ 47,785 (9.6%) 16,821 (17.2%) 64,606 (10.8%) 2.42 (2.37, 2.47)
ED Departure Status
 Admitted 85,750 (69.4%) 37,833 (30.6%) 123,583 (20.7%)  
 Discharged 412,144 (87.3%) 60,168 (12.7%) 472,312 (79.3%)  
Race/Ethnicity
 White 425,872 (82.9%) 87,916 (17.1%) 513,788 (86.2%) ref.
 Black 26,599 (89.4%) 3146 (10.6%) 29,745 (5%) 0.57 (0.55, 0.60)
 Hispanic 12,730 (87.5%) 1826 (12.5%) 14,556 (2.4%) 0.70 (0.66, 0.73)
 Asian 8156 (86.1%) 1317 (13.9%) 9473 (1.6%) 0.78 (0.74, 0.83)
 Other 24,537 (86.6%) 3796 (13.4%) 28,333 (4.8%) 0.75 (0.72, 0.78)
Primary Care Provider
 No 214,304 (80.2%) 52,982 (19.8%) 267,286 (44.9%) 1.57 (1.54, 1.58)
 Yes 283,590 (86.3%) 45,019 (13.7%) 328,609 (55.1%) ref.
  1. All p-values are significant at the < 0.001 level, other than 2005 vs. Ref which was p = 0.46 and asthma p = 0.004