Statistical Analysis
Statistical analysis was completed using IBM SPSS 23.0 (SPSS for
Windows, SPSS Inc., Chicago, IL, USA). The Shapiro–Wilks test was used
for normality testing of native thiol, total thiol, disulphide level,
disulphide/native thiol, disulphide/total thiol, and native thiol/total
thiol ratios. The groups displayed normal distribution. The independent
samples t‑test, among parametric tests, was used to investigate whether
there were considerable differences between the groups. P <
0.05 was accepted as statistically significant.