Table 2 Distribution of patients at different levels of risk for VTE in the four groups.

From: Different combination strategies for prophylaxis of venous thromboembolism in patients: A prospective multicenter randomized controlled study

Group Risk level

A

B

C

D

Overall

χ2

Moderate

102

113

95

101

411

 

High

35

31

34

33

133

5.383

Very high

22

13

24

22

81

 

Overall

159

157

153

156

625

 
  1. Note: P < 0.05, among the four groups.
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