Statistical analysis
The statistic SPSS data were analysed with SPSS 20.0 software
(SPSS Inc., IL, USA).All values were expressed as mean plus or minus
standard deviation. Analysis of variance (ANOVA) was also used to
analyse the experimental data. Statistical significance was set to
p < 0.05. The fibre diameter measurement values were obtained by
digitizer software and analysed by using SPSS software.