Assessment of quadriceps muscle thickness using bedside ultrasonography by nurses and physicians in the intensive care unit: Intra- and inter-operator agreement

Table 2 Intraclass correlation coefficient for intraoperator variation among five operators

Operator		Measurements	ICC (95%CI); P value	Cronbach’s alpha
ID	Level
1	Consultant	1stvs 2nd	0.997 (0.992-0.999); < 0.0001	0.998
		1stvs 3rd	0.997 (0.993-0.998); < 0.0001	0.997
		2ndvs 3rd	0.998 (0.996-0.999); < 0.0001	0.998
		Overall	0.998 (0.997-0.999); < 0.0001	0.997
2	Fellow	1stvs 2nd	0.997 (0.995-0.998); < 0.0001	0.997
		1stvs 3rd	0.997 (0.995-0.997); < 0.0001	0.997
		2ndvs 3rd	0.997 (0.995-0.998); < 0.0001	0.997
		Overall	0.998 (0.997-0.999); < 0.0001	0.998
3	Fellow	1stvs 2nd	0.997 (0.995-0.999); < 0.0001	0.997
		1stvs 3rd	0.997 (0.995-0.999); < 0.0001	0.997
		2ndvs 3rd	0.998 (0.996-0.998); < 0.0001	0.998
		Overall	0.997 (0.995-0.999); < 0.0001	0.998
4	Nurse	1stvs 2nd	0.998 (0.996-0.999); < 0.0001	0.998
		1stvs 3rd	0.997 (0.995-0.999); < 0.0001	0.998
		2ndvs 3rd	0.999 (0.998-0.999); < 0.0001	0.999
		Overall	0.999 (0.998-0.999); < 0.0001	0.999
5	Nurse	1stvs 2nd	0.998 (0.996-0.999); < 0.0001	0.998
		1stvs 3rd	0.997 (0.995-0.998); < 0.0001	0.997
		2ndvs 3rd	0.998 (0.996-0.999); < 0.0001	0.998
		Overall	0.998 (0.997-0.999); < 0.0001	0.998

CI: Confidence interval; ICC: Intraclass correlation coefficient.