Groups

Cases

D-dimer testing positive (% of cases)

Lower extremity vascular Doppler ultrasound positive (% of cases)

Group 1 Group 2 Group 3

163 149 236

39.3(64/163)

25.5(38/149)

26.3(62/236)

9.2(15/163)

2.0(3/149)

2.5(6/236)

Statistical Value P-Value

9.67 0.008

12.95 0.002