Table 3

Differences in muscle strength between sides according to age

Age (years)	N	Mean±SD			p Value for Δ*
Age (years)	N	D	ND	Δ	p Value for Δ*
FDI
≤30	60	4.00±0.52	4.05±0.59	−0.05±0.29	0.582
31–40	55	4.00±0.75	4.04±0.79	−0.04±0.33
41–50	68	3.76±0.82	3.72±0.93	0.04±0.37
51–70	88	3.34±1.04	3.35±1.12	−0.01±0.48
Overall	271	3.72±0.87	3.74±0.96	−0.01±0.38
APB
≤30	60	4.12±0.67	4.20±0.66	−0.08±0.38	0.298
31–40	55	4.00±0.88	3.96±0.90	0.04±0.33
41–50	68	3.90±0.88	3.93±0.87	−0.03±0.34
51–70	88	3.42±1.15	3.43±1.19	−0.01±0.47
Overall	271	3.81±0.98	3.83±1.00	−0.02±0.39
AT
≤30	60	3.90±1.00	3.90±0.93	0.00±0.66	0.309
31–40	55	3.89±0.98	3.75±1.09	0.15±0.52
41–50	67†	3.30±1.35	3.28±1.42	0.01±0.44
51–70	88	2.83±1.57	2.83±1.58	0.00±0.64
Overall	270	3.40±1.37	3.37±1.39	0.03±0.58
TS
≤30	60	4.83±0.49	4.82±0.50	0.02±0.13	0.036
31–40	54†	4.78±0.63	4.76±0.67	0.02±0.24
41–50	67†	4.51±1.12	4.54±1.11	−0.03±0.17
51–70	88	4.34±1.25	4.25±1.32	0.09±0.36
Overall	269	4.58±1.00	4.55±1.03	0.03±0.26

Bold value indicates significant difference.
Average difference (Δ=D−ND) of strength between DH and NDH is shown by age. Values indicate the mean and SD of all tested muscles.
*Between age classes overall comparison by Kruskal–Wallis test.
†One missing value.
APB, abductor pollicis brevis; AT, anterior tibialis; D, dominant side; DH, dominant hand; FDI, first dorsal interosseous; N, number of tested patients; ND, non-dominant side; NDH, non-dominant hand; TS, triceps surae.