Table 4 PHQ-9 scores across ED group status in a Kruskal-Wallis test with Mann-Whitney U post hoc pairwise tests
Non-parametric K independent ANOVA | |||||||
|---|---|---|---|---|---|---|---|
Group | N | Md | IQR | Mean ranks | Kruskal-Wallis H | df | Significance level |
Previous ED | 148 (18.7%) | 10 | 5–15 | 367.96 | 274.27 | 2 | .001 |
Current ED | 272 (34.3%) | 17 | 12–21 | 538.21 | |||
No lifetime ED | 330 (41.6%) | 5 | 3–10 | 244.77 | |||
Mann-Whitney U tests (post hoc pairwise comparisons) | |||||||
Comparison | U | z | Significance level | Effect size (r) | |||
Previous ED vs current ED | 9997.00 | −8.53 | .001 | −.42 | |||
Previous ED vs no lifetime ED | 15,405.50 | −6.47 | .001 | −.30 | |||
Current ED vs no lifetime ED | 10,753.00 | −16.08 | .001 | −.66 | |||