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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