[Analyzing Effect of Shenmai Injection on Levels of WBC and Neutrophilic Granulocytes Using Propensity Score Method].

Objective To observe the effect of Shenmai Injection (SI) on levels of white blood cell (WBC) and neutrophilic granulocyte. Methods Case data in Hospital Information System ( HIS) were collected including patients who used SI (as the experimental group) and those who unused SI (as the control group). Data of their WBC and neutrophilic granulocyte in routine blood test were extracted. The bias of confounding factors were balanced based by propensity score matching (PSM). Data were analyzed using X² test. Results The samples after being matched (0. 661 ) was less than the samples before being matched (0. 710). Totally 5 138 cases were successfully matched in the total of 7 256 cases in the control group. There was statistical difference in increased levels of WBC and neutrophilic granulo- cyte between the two groups (X² =10. 312 ,P = 0. 027; X² =14. 228 ,P =0. 013). There was no statistical difference in decreased levels of WBC and neutrophilic granulocyte between the two groups (X² =1. 385, P = 0. 536; X² = 2. 339,P = 0. 126). Conclusion Results based the data of HIS and present research methods showed that SI might have effect on increased levels of WBC and neutrophilic granulocyte, but no effect on their decreased changes.