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Table 2 Inter-rater correlation and percentage agreement of the presence or absence of morbidity as measured by the POMS

From: Measuring outcomes after major abdominal surgery during hospitalization: reliability and validity of the Postoperative Morbidity Survey

  Day 1 (n = 51) Day 2 (n = 51) Day 3 (n = 51) Day 4 (n = 46) Day 5 (n = 40) Total (n = 263)
Percentage agreement (%) 100 100 100 95.7 95 97.7
κ correlation coefficient (95% CI) N/A 1.0 (1.0-1.0) 1.0 (1.0-1.0) 0.873 (0.760-1.0) 0.895 (0.760-1.0) 0.912 (0.842-0.982)
  1. When observers scored all patients the same the hypothetical probability of chance could not be calculated, and are labeled N/A.