Definition 1: <3 month vs. >=3 month
There was discrepancy in operative time (MD, -41.35; 95% Cl, −58.86 to -23.85; P <0.00001), with moderate to high heterogeneity (I2=37%). When omitting Li2022, the heterogeneity decreased to 0%, the p-value was still statistically significant (P<0.00001). The heterogeneity may have resulted from the article didn’t published. Publication bias was assessed and not detected.