Sample size and statistical analysis
RA
According to the results of preliminary research and follow-up of some people in our department, the predictive effective rate of RA was 98%, that of ASA was 78%, and that of Dalteparin sodium was 87%, with α = 0.05 and 1- β = 0.8. Thereafter, the sample size was estimated by SPSS software (version 26.0, IBM Corp., Armonk, USA), and the final calculation result was SPSS software was employed for statistical analysis. The normally-distributed measurement data were represented by mean ± standard deviation (SD). One-way analysis of variance (ANOVA) was utilized to compare three groups, while two-way repeated measurement ANOVA was used to compare different time points of each group, one-way repeated measurement ANOVA was adopted for comparison of indicators at different time points in the same group, and pairwise comparison was completed with the LSD method. The classification and counting data were expressed as %, and comparison between groups was expressed as χ