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Table 3 Difference in the proportion of diagnostic tests performed in the control and intervention groups.

From: Economic evaluation of a clinical protocol for diagnosing emergency patients with suspected pulmonary embolism

  Control n = 185 Intervention n = 745 Absolute risk difference Pearson Chi-Square Statistics (df = 1) P-value
D-dimer 54.1% 93.2% 48.9% 181.5 <0.0001
VQ 70.3% 52.9% -17.4% 18.2 <0.0001
LLUS 20.5% 17.6% -2.9% 0.87 0.4
CTPA 9.2% 8.1% -1.1% 0.25 0.6