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Table 1 Trends in ED Computed Tomography Use by Study Year (2003–2012) and Patient Demographics

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

Year 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
Rate per 1000 ED visits with CT obtained 142.0 154.3 143.5 164.1 163.6 173.3 176.5 179.7 176.6 169.2*
Age
  < 18 56.9 55.1 52.3 56.1 48.2 49.0 44.0 40.2 36.6 33.5
 18–34 136.5 146.0 130.8 149.9 142.6 149.3 155.9 155.7 144.8 143.6
 35–49 155.7 174.0 156.7 179.2 177.2 189.1 198.2 191.4 198.4 183.5
 50–64 176.9 192.1 176.3 198.6 210.6 221.0 222.6 219.9 226.6 218.6
 65–79 198.2 204.3 205.1 229.1 230.3 243.6 257.4 271.1 262.9 262.0
  > 79 226.5 235.7 226.3 249.7 269.6 283.7 279.4 288.1 285.5 304.0
Gender
 Female 145.1 160.0 142.9 166.7 167.5 175.0 175.1 182.3 180.9 174.2
 Male 138.7 148.3 144.2 161.2 159.5 171.6 178.0 176.9 171.9 163.8
Primary Care Provider
 No 169.4 178.1 175.8 200.3 197.5 207.3 218.4 212.0 215.3 205.8
 Yes 118.9 134.3 119.1 105.9 134.9 145.0 141.3 153.2 147.0 142.0
  1. *p < 0.001 for the trend