Comparison of single-piece and multiple-piece cartilage grafts for the repair of large tympanic membrane perforations: a randomized controlled trial

Statistical analyses were performed using SPSS version 19 (IBM Corp.). Continuous variables are presented as means ± standard deviations, whereas categorical variables are presented as numbers or percentages. The chi-squared test was used to compare categorical variables. The Wilcoxon and Mann-Whitney U-tests were used to compare non-parametric variables between the two groups. Analyses of variance were used to compare preoperative and postoperative ABG and BC variables, with preoperative hearing status included as a covariate. P-values < 0.05 were considered statistically significant.