Statistical analysis
All the data were analysed using IBM SPSS Statistics Version 21 (IBM Corp., Armonk, NY, USA). Normally distributed continuous data were presented as the mean ± standard deviation. Data with a skewed distribution were expressed as the median (quartile). Categorical variables were expressed as percentage. The baseline characteristics between the two groups were compared using Student’s t-tests, Mann–Whitney U tests or Chi-Square tests, depending on the appropriate value properties. Logistic regression analysis was used for correlation analysis. The results of poor outcome at 3 months were present as odds ratios (ORs) and 95% confidence intervals (CIs). The AUC of the receiver operator characteristic (ROC) curve was computed using the predicted probability of poor outcome. The results were considered significant when P < 0.05.