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Table 2
Visual analog score (in centimeter) for both knees in each group before and after treatment
	Right Knee				Left Knee
	Before	After	P	Effect size	Before	After	P	Effect size
KIN (n = 16)	6.9 ± 1.9 (5.0 – 10.0)	2.3 ± 2.7^a (0.0 – 8.0)	0.0001	0.70	7.0 ± 2.1 (4.0 – 10.0)	2.4 ± 2.8^a (0.0 – 7.0)	0.0008	0.68
TENS (n = 12)	8.0 ± 1.5 (6.0 – 10.0)	2.6 ± 2.9^a (0.0 – 7.5)	0.0001	0.76	5.6 ± 2.7 (0.0 – 10.0)	2.3 ± 2.5^a (0.0 – 9.0)	0.004	0.53
US (n = 12)	6.6 ± 3.0 (0.0 – 10.0)	4.5 ± 3.7^a (0.0 – 10.0)	0.009	0.41	7.3 ± 2.3 (4.0 – 10.0)	3.8 ± 3.1 (0.0 – 7.0)	0.054	0.54

Data expressed as mean ± S.D. (min – max).

^a different from before for the same group.

Mascarin et al. BMC Musculoskeletal Disorders 2012 13:182 doi:10.1186/1471-2474-13-182