Reproducibility of Static and Dynamic Postural Control Measurement in Adolescent Athletes with Back Pain

Table 1

(a) Mean ± SD (mm), 95% CI, and effect size for the outcome measures of the one-legged stance test for subjects with back pain during test and retest sessions.

		Test		Retest
	Rt	Mean ± SD (mm)	95% CI	Mean ± SD (mm)	95%CI	Effect size
BP	COP_ap	295.8 ± 94.8	241.0 – 350.5	253.0 ± 64.5	215.8 – 290.3	0.527
	COP_ml	263.6 ± 58.8	229.6 – 297.5	274.2 ± 75.6	230.6 – 317.9	-0.157
	COP_total	434.6 ± 113.9	368.8 – 500.4	413.9 ± 104.1	353.8 – 474.0	0.190
	Lt
	COP_ap	276.3 ± 100.2	218.4 – 334.2	268.7 ± 79.3	222.9 – 314.5	0.084
	COP_ml	253.9 ± 51.4	224.2 – 283.6	266.1 ± 75.1	222.7 – 309.5	-0.190
	COP_total	416.4 ± 113.5	350.9 - 481.9	424.7 ± 114.8	358.4 - 491.0	-0.059

left/right: Lt/Rt.

(b) Mean ± SD (mm), 95% CI, and effect size for the outcome measures of the one-legged stance test for subjects without back pain during test and retest sessions.

		Test		Retest
	Rt	Mean ± SD (mm)	95% CI	Mean ± SD (mm)	95%CI	Effect size
NBP	COP_ap	288.1 ± 72.1	251.0 – 325.1	315.1 ± 123.8	251.5 – 378.7	-0.238
	COP_ml	292.5 ± 82.4	250.1 – 334.8	307.5 ± 130.1	240.6 – 374.4	-0.121
	COP_total	462.5 ± 122.0	399.8 – 525.3	498.0 ± 211.3	389.3 – 606.7	-0.184
	Lt
	COP_ap	288.8 ± 69.9	252.9 – 324.8	292.7 ± 80.5	251.3 – 334.1	-0.043
	COP_ml	296.6 ± 61.9	264.8 – 328.5	274.1 ± 67.9	239.1 – 309.0	0.287
	COP_total	459.0 ± 101.1	407.0 – 511.0	446.1 ± 112.3	388.3 – 503.8	0.100

left/right: Lt/Rt.