Definition 1: <3 month vs. >=3 month
There was no pronounced difference in the number of major complications (OR,
0.80; 95% Cl, 0.16 to 4.10; P=0.79), with high geneity (I2=70%). The sensitivity analysis indicated that noteworthy heterogeneity existed in Gulack2017. When they were omitted, the heterogeneity decreased from 70% to 0%, but still with no statistically significant (P=0.32). The reason can’t be found. Publication bias was assessed and not detected.