2.9. Statistical analysis

YC Yuxuan Chen
YM Yixiao Ma
ZZ Zhiqiang Zhang
YZ Yaning Zhang
JJ Jian Jia
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The collected data were analyzed statistically by SPSS 22.0 software. Chi-square test was used for counting data. Mean ± standard deviation (x¯ ± S) was used for measurement data, independent sample t test was used for normal distribution, and Mann-Whitney U test was used for skewness distribution. The difference was considered statistically significant when P < .05.

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