2.7 Statistical Analysis
SPSS software version 21.0 was used for statistical analysis.
Independent samples t-test was performed on the quantitative data which
conform to the normal distribution.The data were expressed as
mean±standard deviation (SD). Otherwise, Manner-Whitney U test was used
for analyzing the differences of clinical characteristics between two
groups and the data were expressed as median (maximum-minimum).
p<0.05 was considered statistically significant.