Table 3

Test–retest reliability for Jadad and Newcastle–Ottawa Scales: comparison of total scale scores for individual raters after two assessments

ScaleICC(2,1) (95% CI), consistency*ICC(2,1) (95% CI), absolute agreement
Jadad—six item0.56 (0.42 to 0.67)0.55 (0.41 to 0.67)
Jadad—three item0.67 (0.55 to 0.76)0.67 (0.55 to 0.76)
Newcastle–Ottawa—cohort0.61 (0.24 to 0.82)0.62 (0.25 to 0.83)
Newcastle–Ottawa—case–control0.85 (0.55 to 0.95)0.83 (0.48 to 0.95)
  • * ICC(2,1) where systematic differences between raters are irrelevant.

  • ICC(2,1) where systematic differences between raters are relevant.

  • ICC, intraclass correlation coefficient.