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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