Definition 2: <12 month vs. >=12 month
There was statistically significant in operating time (MD, -27.05; 95% Cl, −51.11 to -2.99; P=0.03), with high heterogeneity (I2=75%). The sensitivity analysis didn’t show the noteworthy heterogeneity in the included article. The publication bias was assessed and not detected.
In sum, to decrease the operating time, it may be well to perform the surgery as soon as possible.