Skip to main content

Table 3 Polychoric correlations between R-SMS-DS score and PHQ-9 items

From: Validity of single item responses to short message service texts to monitor depression: an mHealth sub-study of the UK ACUDep trial

PHQ-9 items Group 2 Group 3 Grp 2 - Grp 3
Patients with PHQ-9 & R-SMS-DS (any time) N = 337 Patients with PHQ-9 & R-SMS-DS (within 6 days) N = 213 Patients with PHQ-9 & R-SMS-DS (outside 6 days) N = 113
1. Loss of interest (anhedonia) .573 .593 .545
2. Depressed mood .607 .619 .561
3. Sleep disturbance .474 .458 .517
4. Fatigue .479 .487 .481
5. Appetite changes .472 .513 .425
6. Feeling bad about oneself .588 .665 .454
7. Concentration difficulties .450 .485 .414
8. Psychomotor disturbance .421 .404 .473
9. Thoughts of death/self-harm .436 .472 .381