Fig. 2From: Validation of the phenol red thread test in a Chinese populationScatter diagrams showing the correlations between the PRT test and DED parameters. A Spearman correlation by rank test between the PRT test and Schirmer I test (P < 0.05, ρ = 0. 385). B Spearman correlation by rank test between the PRT test and TMH assessment (P < 0.05, ρ = 0.306)Back to article page