From: Longitudinal measurement invariance of the patient health questionnaire in a German sample
 | Total sample | Intervention group | Control group | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
 | N | Sex (f) | Mean age (SD) | PHQ-8 | N | Sex (f) | Mean age (SD) | PHQ-8 | N | Sex (f) | Mean age (SD) | PHQ-8 |
Baseline | 588 | 61.7% | 39.3 (14.0) | 13.9 (3.8) | 291 | 65.6% | 39.7 (14.0) | 13.9 (3.8) | 297 | 57.9% | 38.9 (14.1) | 13.8 (3.8) |
2-months | 246 | 65.0% | 40.2 (13.9) | 9.9 (5.0) | 246 | 65.0% | 40.2 (13.9) | 9.9 (5.0) | – | – | – | – |
4-months | 225 | 62.7% | 40.6 (13.8) | 9.9 (5.1) | 225 | 62.7% | 40.6 (13.8) | 9.9 (5.1) | – | – | – | – |
6-months | 437 | 60.2% | 40.4 (14.0) | 10.4 (5.2) | 215 | 62.8% | 40.4 (13.9) | 10.4 (5.3) | 222 | 57.7% | 40.3 (14.1) | 10.5 (5.1) |
12-months | 447 | 59.7% | 40.4 (13.9) | 10.2 (5.4) | 220 | 62.7% | 40.3 (13.8) | 10.7 (5.5) | 227 | 56.8% | 40.5 (13.9) | 9.8 (5.3) |