Table 2.

Within and between session reliability of the thickness and cross-sectional area in subjects with multifidus myofascial pain syndrome

Examiner	Sonographic measures	Within –session intra-examiner				Between session intra-examiner
		(Mean) (SD), test	ICC, Test	(Mean) (SD), Re-test	ICC, Re-test	ICC	SEM	MDC
1st Examiner	Thickness(rest,cm)	[3.51] [0.52]	[0.93]	[3.55] [0.63]	[0.96]	[0.88] [0.75,0.94]	[0.16]	[0.32]
	Thickness(contraction,cm)	[3.77] [0.59]	[0.89]	[3.66] [0.61]	[0.92]	[0.78] [0.56,0.90]	[0.21]	[0.41]
	Thickness change%	[7.98] [10.31]	[0.87]	[7.45] [77.82]	[0.87]	[0.84] [0.80,0.88]	[0.58]	[1.16]
	CSA (rest, cm2)	[15.36] [1.34]	[0.84]	[16.16] [1.41]	[0.88]	[0.86] [0.84,0.88]	[0.32]	[0.64]
	CSA (contraction, cm2)	[16.32] [1.83]	[0.83]	[16.30] [1.96]	[0.87]	[0.88] [0.87,0.89]	[0.67]	[1.33]
2nd Examiner	Thickness(rest,cm)	[3.58] [0.62]	[0.94]	[3.61] [0.42]	[0.95]	[0.86] [0.83,0.88]	[0.22]	[0.44]
	Thickness(contraction,cm)	[3.73] [0.68]	[0.92]	[3.74] [0.67]	[0.93]	[0.90] [0.85,0.93]	[0.25]	[0.61]
	Thickness change%	[4.56] [9.63]	[0.90]	[4.89] [7.87]	[0.88]	[0.88] [0.85,0.90]	[0.72]	[1.44]
	CSA (rest, cm2)	[15.17] [1.32]	[0.88]	[15.21] [1.27]	[0.90]	[0.87] [0.83,0.91]	[0.29]	[0.58]
	CSA (contraction, cm2)	[16.36] [2.05]	[0.88]	[17.32] [2.09]	[0.84]	[0.87] [0.83,0.91]	[0.71]	[1.42]

SD, Standard Deviation; ICC, Intra-class Correlation Coefficients; SEM, Standard Error of Measurement; MDC, Minimal Detectable Change; CSA, Cross-Sectional Area