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Table 6 Pearson’s correlation and Kendall’s tau coefficients between the R8 Depression and the PHQ-9 scores

From: Validation of a novel online depression symptom severity rating scale: the R8 Depression

Sample n Pearson’s correlation* p value** Kendall’s tau p value*
Baseline 236 0.83 < 0.001 0.64 < 0.001
Baseline + reviews 1053 0.90 < 0.001 0.75 < 0.001
Baseline + reviews + normative 1240 0.91 < 0.001 0.76 < 0.001
  1. *r-squared, **2-tailed test