TABLE 5.

Between-Days, Inter-Examiner Procedural Reliability for L4/5 Multifidus Thickness Assessment.

Younger Adults (n=30)	Examiner 1 mean thickness (SD)	Examiner 2 mean thickness (SD)	ICC (95% CI)	SEM	MDC (95%)
resting*	2.99 (0.44)	2.87 (0.52)	.84 (.66, .92)	0.19	0.53
during limb lift*	3.75 (0.46)	3.67 (0.54)	.88 (.75, .94)	0.17	0.48
% thickness change†	20.2 (6.0)	28.7 (12.1)	.31 (−.21, .64)	7.4	20.7
resting ALT*	3.28 (0.50)	3.22 (0.60)	.90 (.80, .95)	0.17	0.47
during limb lift ALT*	4.10 (0.50)	4.08 (0.62)	.90 (.80, .95)	0.17	0.48
% thickness change ALT†	20.0 (5.1)	28.0 (10.0)	.59 (.02, .81)	5.1	14.1
Older Adults (n=28)
resting*	3.34 (0.81)	3.19 (0.73)	.86 (.70, .93)	0.29	0.80
during limb lift*	4.00 (0.82)	3.86 (0.69)	.89 (.76, .94)	0.26	0.71
% thickness change†	21.1 (9.1)	22.7 (13.9)	.71 (.38, .86)	5.8	16.3
resting ALT*	3.65 (0.80)	3.57 (0.82)	.87 (.72, .94)	0.29	0.82
during limb lift ALT*	4.35 (0.82)	4.23 (0.78)	.89 (.77, .95)	0.26	0.73
% thickness change ALT†	20.3 (7.5)	20.3 (12.8)	.49 (−.27, .75)	8.5	23.7

Abbreviations: ALT=alternate measurement technique; CI=confidence interval; ICC=intraclass correlation coefficient; MDC=minimal detectable change; SD=standard deviation; SEM=standard error of measurement.

^*Resting and limb lift means, standard deviations, SEMs, and MDCs are provided in centimeters.

^†Percent thickness change was calculated ((thickness during limb lift-resting thickness)/resting thickness)*100.