Table 1.

Scanning and reading procedure for every participant for the measurement of mean carotid IMT.

Visit	Sonographer	Reader	Replicate
A	X	x	1
		x	2
		y	1
		y	2
	Y	x	1
		x	2
		y	1
		y	2
B	X	x	1
		x	2
		y	1
		y	2
	Y	x	1
		x	2
		y	1
		y	2

Every participant performed two visits (A and B). At every visit they were scanned twice by each of the sonographers X and Y, and every scanning was read twice (replicate 1 and 2) by each of the two readers (x and y).