Table 6. Logistic regression analysis and multiple regression analysis results.

OR, odds ratio; SE, standard error; CI, confidence interval; OS, open surgery.

^a)Adjusted estimates yielded by the model. ^b)For the OS group vs. the LS group. ^c)Tertiary and general hospitals are compared with other hospitals.

^*P < 0.05, ^**P < 0.01, ^***P < 0.001.