Table 3.

Spline regression modeling to evaluate the factors that influence handgrip strength.

Variables	Estimate	SE	t value	p value
Intercept	−85.59	24.50	−3.49	0.006
Number variables in HGS protocol	8.24	2.11	3.89	0.003
Sample_size	1.90	1.20	1.58	0.147
Group (non-DS)	1.45	6.41	0.22	0.825
Cat_age (Adults)	47.61	9.82	4.84	0.0009
Cat_age (Children)	36.63	17.83	2.05	0.07
BMI (obesity)	−15.68	7.54	−2.07	0.06
BMI (overweight)	−1.98	5.31	−0.37	0.71

DS: Down syndrome; BMI: Body mass index; SE: Standard Error.