1.6 Statistical Analysis
Statistical analyses were performed using SPSS (v. 19.0) software with
an α of 5%. The measurement data are presented as mean ± standard
deviation or median (interquartile range [IQR] P25, P75).
Comparisons between two groups were made using a
T-test and Wilcoxon’s rank sum
test. Enumeration data are expressed as percentages using the χ2 test.