Statistical Analysis
Continuous variables were reported as mean values (standard deviation)
or median [interquartile range] and were compared using the
Student’s t test or Wilcoxon’s rank-sum test as appropriate.
Categorical variables were expressed as number (percentage) and were
compared using Fisher’s exact test. Survival analysis was performed
using a Kaplan-Meier estimator and estimates of survival were compared
using the log-rank test. Statistical analyses were conducted using R
version 3.0.2 (R Foundation, Vienna, Austria) and the survival
package.