Table 4 Correlation between the clinical gold standard (OHSI) and self-assessment scales

OHSI vs. eleven-step numerical rating scale from 0 to 10

r = 0.487^a, p < 0.001, n = 77

r = 0.416^a, p < 0.001, n = 70

OHSI vs. six-step numerical rating scale from 1 to 6 (school grades)

r = 0.477^a, p < 0.001, n = 76

r = 0.533^a, p < 0.001, n = 70

OHSI vs. five-step Likert scale (verbal)

r_S = 0.536^b, p < 0.001, n = 77

r_S = 0.547^b, p < 0.001, n = 74

OHSI vs. five-step Likert scale (photographic guide)

r_S = 0.415^b, p < 0.001, n = 73

r_S = 0.543^b, p < 0.001, n = 68