Table 4 Internal validity of R8 Depression and PHQ-9
From: Validation of a novel online depression symptom severity rating scale: the R8 Depression
Population | R8 Depression | PHQ-9 | ||||
|---|---|---|---|---|---|---|
n | Cronbach’s a | Guttman | n | Cronbach’s a | Guttman | |
Baseline | 270 | 0.91 | 0.91 | 236 | 0.88 | 0.85 |
Baseline + reviews | 1124 | 0.92 | 0.92 | 1053 | 0.90 | 0.87 |
Baseline + reviews + normative | 1328 | 0.93 | 0.93 | 1240 | 0.90 | 0.88 |