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Table 4 Radiology orders during the study periods

From: The impact of a multimodal intervention on emergency department crowding and patient flow

Categories of imaging procedures n (%)a Pre-intervention period n = 20,080 Intervention period n = 20,590 Odds ratio (95% CI) p valueb
Plain radiograph 11,327 (56.4) 10,962 (53.0) 0.87 (0.84–0.91) < 0.001
CT* 6094 (30.3) 6670 (32.2) 1.09 (1.05–1.14) < 0.001
Ultrasonography 2511 (12.5) 2799 (13.5) 1.10 (1.03–1.16) 0.002
Other imaging procedurec 150 (0.7) 256 (1.2) 1.67 (1.36–2.04) < 0.001
  1. *Abbreviation: CT computer tomography
  2. aBased on 40,670 orders, due to 99 missings
  3. bp value was calculated using χ2 test
  4. cOther imaging procedures includes magnetic resonance imaging and radiograph with contrast