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Prevalence of Depressive Symptoms (Beck Depression Inventory II total score > 13) including and excluding the items with differential item functioning
| BDI-II > 13 (21 items) n (%) | BDI-II > 13 (17 items) n (%) | p-valuea | |
|---|---|---|---|
| 13 years of age | |||
| Girls | 195 (18.8) | 213 (20.5) | 0.004 |
| Boys | 72 (7.6) | 84 (8.8) | 0.014 |
| 17 years of age | |||
| Girls | 202 (17.9) | 208 (18.4) | 0.429 |
| Boys | 68 (6.8) | 84 (8.4) | <0.001 |
McNemar's χ2 test with continuity correction.
