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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