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All data were analyzed by SPSS25. Kolmogorov Smirnov test was used to evaluate the normal distribution of variables. The measurement data that approximate or conform to the normal distribution were expressed as mean ± standard deviation, while those that do not conform to normal distribution were expressed as median (quartile interval). The enumeration data were expressed as the corresponding number of cases. Two independent samples Mann–Whitney U test was used for comparison between groups. Spearman correlation analysis was used to evaluate the correlation between NLR and various Indexes. ROC curves were used to examine the various cutoff values of pre-operative and post-operative NLR to predict the need for mechanical ventilation beyond 24 h, 48 h and 72 h respectively. All tests were performed 2-tailed, with P < 0.05 considered statistically significant.

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