TABLE 4.

Within-Day, Inter-Examiner Procedural Reliability for L4/5 Multifidus Thickness Assessment.

Younger Adults (n=31)	Examiner 1 mean thickness (SD)	Examiner 2 mean thickness (SD)	ICC (95% CI)	SEM	MDC (95%)
resting*	2.97 (0.44)	2.93 (0.47)	.90 (.80, .95)	0.14	0.40
during limb lift*	3.73 (0.46)	3.70 (0.47)	.90 (.79, .95)	0.15	0.41
% thickness change†	20.3 (6.0)	27.2 (10.1)	.47 (−.07, .74)	10.1	28.2
resting ALT*	3.26 (0.50)	3.28 (0.53)	.91 (.83, .96)	0.15	0.41
during limb lift ALT*	4.08 (0.51)	4.10 (0.53)	.92 (.84, .96)	0.14	0.40
% thickness change ALT†	20.1 (5.1)	26.1 (9.6)	.59 (.02, .81)	4.4	12.4
Older Adults (n=30)
resting*	3.38 (0.80)	3.22 (0.71)	.88 (.74, .94)	0.26	0.73
during limb lift*	4.06 (0.83)	3.94 (0.72)	.90 (.79, .95)	0.24	0.68
% thickness change†	21.1 (9.0)	24.3 (12.0)	.66 (.31, .83)	5.8	16.1
resting ALT*	3.71 (0.81)	3.53 (0.73)	.86 (.71, .93)	0.28	0.78
during limb lift ALT*	4.43 (0.85)	4.33 (0.69)	.88 (.75, .94)	0.27	0.74
% thickness change ALT†	20.4 (7.4)	24.1 (11.5)	.63 (.25, .82)	5.4	15.1

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.