The effect of combined balance and strength exercise program in patients with different grades of primary knee osteoarthritis

Egyptian Rheumatology and Rehabilitation

Table 3 Comparison between the different studied groups according to 1-RM

	Group 1 (n = 20)		Group 2 (n = 20)		Group 3 (n = 20)		Group 4 (n = 20)		H	p
	Before	After	Before	After	Before	After	Before	After	H	p
1-RM (kg) median (min.–max.)	4.72 (2.36–7.1)	7.1 (2.36–7.1)	4.72 (2.36–7.1)	7.1 (2.36–7.1)	2.36 (2.36–7.1)	4.72 (2.36–7.1)	2.36 (2.36–4.72)	2.36 (2.36–7.7)
z (p₀)	2.714^* (0.007^*)		2.887^* (0.004^*)		3.355^* (0.001^*)		2.636^* (0.008^*)
Mean difference (mean ± SD)	0.96 ± 1.18		1.07 ± 1.21		1.90 ± 1.46		1.09 ± 1.52		5.47	0.14
Percentage of change (%) (mean ± SD)	30.59 ± 40.75		25.17 ± 30.50		65.21 ± 61.08		43.83 ± 62.96		5.656	0.13

1-RM 1 repetition maximum, kg kilograms, SD standard deviation, H Kruskal–Wallis test, Z Wilcoxon signed-rank test
p: p value for comparing between the studied groups
p₀: p value for comparing between before and after
^*Statistically significant at p ≤ 0.05