Statistical methodology
Numerical data were explored for normality by checking the distribution of data and using tests of normality (Kolmogorov-Smirnov and Shapiro-Wilk tests). The Pink Esthetic Score data showed a non-parametric distribution. Data were presented as mean, standard deviation (SD), 95% confidence interval for the mean (95% CI), median, and range values. For parametric data, the student’s t-test was used to compare the mean age values in the two groups. For non-parametric data, the Mann-Whitney U test was used to compare the two groups. Wilcoxon signed-rank test was used to study the changes by time within each group. Gender data (qualitative data) was presented as frequencies and percentages. Fisher’s Exact test was used to compare gender distributions in the two groups. The significance level was set at P ≤ 0.05. Statistical analysis was performed with IBM SPSS Statistics for Windows, Version 25.0. Armonk, NY: 1BM C0rp.