| Group 1 | Group 2 | Group 3 | ||||||
---|---|---|---|---|---|---|---|---|---|
N = 602 patients with PHQ-9 | N = 337 patients with PHQ-9 & R-SMS-DS (any time) | N = 213 patients with PHQ-9 & R-SMS-DS (within 6 days) | |||||||
Loadings | Loadings | Loadings | |||||||
One-Factor | Affective | Somatic | One-Factor | Affective | Somatic | One-Factor | Affective | Somatic | |
PHQ-9 Item Descriptive/Variance explained | 64Â % | --- 73Â % --- | 61Â % | --- 69Â % --- | 61Â % | --- 70Â % --- | |||
1. Loss of interest (anhedonia) | .852 | .632 | - | .855 | .540 | - | .854 | .448 | .453 |
2. Depressed mood | .856 | .875 | - | .876 | .768 | - | .882 | .683 | - |
3. Sleep disturbance | .778 | - | .942 | .761 | - | .973 | .740 | - | .994 |
4. Fatigue | .794 | - | 1.078 | .794 | - | 1.041 | .779 | - | .831 |
5. Appetite changes | .718 | - | .640 | .700 | - | .617 | .719 | - | .573 |
6. Feeling bad about oneself | .816 | .972 | - | .840 | 1.244 | - | .846 | 1.169 | - |
7. Concentration difficulties | .791 | .554 | - | .738 | .411 | - | .746 | - | .634 |
8. Psychomotor disturbance | .735 | .507 | - | .690 | .405 | - | .700 | - | .714 |
9. Thoughts of death or self-harm | .704 | .894 | - | .724 | .860 | - | .719 | .826 | - |
R-SMS-DS: ‘How depressed have you felt?’ | n/ab | n/ab | n/ab | .656 | .501 | - | .692 | .616 | - |
Correlation between factors | Â | --- .834 --- | Â | --- .820 --- | Â | ---.793 --- |