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Table 1 Intra-class correlation coefficient in the arch width measurements

From: A two-year comparative assessment of retention of arch width increases between modified vacuum-formed and Hawley retainers: a multi-center randomized clinical trial

ICC n Coefficient 95% confidence interval P value
Lower bound Upper bound
Intra-rater reliability 20 1.00 1.00 1.00  < .001*
Inter-rater reliability 20 0.98 0.53 1.00  < .001*
  1. ICC indicates intra-class correlation coefficient; n, sample size; *, statistical significance