2.12 Statistical analysis
All data were expressed as mean ± SD or medians or 25th to 75th percentiles (neurological function scores). Comparison between two groups was analyzed with two-tailed t-test while differences within multiple groups were measured by one-way ANOVA followed by Tukey’s post hoc multiple comparison tests. Difference in survival rate was examined by the log-rank test. Neurological function scores were compared with Mann–Whitney U test or Kruskal–Wallis with Dunn’s multiple comparisons test. Statistical analysis was conducted using GraphPad Prism Version 6.0 and SPSS 20.0. P < 0.05 was considered statistically significant.