[交流] 看不懂这部分统计方法，求大佬指点 已有1人参与

we used Mann–Whitney U test to assess differences in HADS, PSS, and ISI scores by work environment. Categorical variables were expressed as percentages and analysed using Pearson's χ2 test. 为什么会有那么多“-”。是不是只有最后一个work environment是Mann–Whitney U test 。其余分类变量都是Pearson's χ2？

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