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

Table 7 Intraclass correlation coefficient (ICC)

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

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).

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