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.