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Table 7 Intraclass correlation coefficient (ICC)

From: Mitral annular systolic velocity as a marker of preclinical systolic dysfunction among patients with arterial hypertension

Participants (n=210) ICC (1 observer) 95% CI Strength of agreement ICC (2 observers) 95% CI Strength of agreement
Healthy (n=30) Single measures   Average measures  
Sm lat. (cm/s) 0.7358 0.5329 ÷ 0.8529 Good 0.8478 0.6953 ÷ 0.9240 Very good
Sm sep. (cm/s) 0.9911 0.9867 ÷ 0.9941 Very good 0.9955 0.9933 ÷ 0.9970 Very good
Sm (avg) (cm/s) 0.8634 0.8010 ÷ 0.9010 Very good 0.9216 0.8901 ÷ 0.9450 Very good
HTN (n=90)
Sm lat. (cm/s) 0.7338 0.5170 ÷ 0.8622 Good 0.8465 0.6816 ÷ 0.9260 Very good
Sm sep. (cm/s) 0.9337 0.9020 ÷ 0.9553 Very Good 0.9653 0.9485 ÷ 0.9772 Very good
Sm (avg) (cm/s) 0.8337 0.8015 ÷0.8080 Very Good 0.9059 0.8095 ÷ 0.9210 Very good
DD (n=90)
Sm lat. (cm/s) 0.7841 0.6924 ÷ 0.8509 Good 0.8790 0.8183 ÷ 0.9194 Very good
Sm sep. (cm/s) 0.8049 0.6338 ÷ 0.9009 Very Good 0.8919 0.7759 ÷ 0.9479 Good
Sm (avg) (cm/s) 0.7945 0.7234 ÷ 0.8222 Good 0.8854 0.8005 ÷ 0.9201 Very good
  1. The ICC is a measure of the reliability of measurements or ratings. The table reports two coefficients with their respective 95% CI. Single measures: this is an index for the reliability of the ratings for one, typical, single rater and average measures which is an index for the reliability of different raters averaged together. (<0.20 Poor; 0.21-0.40 Fair; 0.41-0.60 Moderate; 0.61-0.80 Good; 0.81-1.00 Very good).