Table 3.

Bivariate relationship and multivariate regression data of normal pinch strength dominant (multivariate explained variance: 67.7%) (n = 978)

Covariates	Bivariate		Multivariate
	Correlation4	Explained variance5	Partial correlation	Explained variance6	Regression coefficient	Coefficient's significance
Constant	-	-	-	-	-2.637	0.066
Sex1	0.597	35.7%	0.492	24.2%	2.138	<0.001
Age1	-0.389	25.1%	0.187	3.5%	0.079	<0.001
Age2	-0.441	-	-0.237	5.6%	-0.001	<0.001
Height1	0.614	37.7%	0.146	2.1%	0.034	<0.001
Weight1	0.482	23.8%	0.008	<0.1%	0.007	0.796
Weight2	0.470	-	0.024	0.1%	0.001	0.456
Occupation1	0.354	22.9%	0.255	6.5%	2.641	<0.001
Occupation2	0.287	-	-0.230	5.3%	-1.282	<0.001
Occupation3	0.265	-	0.203	4.1%	0.195	<0.001

¹ linear: coefficient times variable, ² quadratic: coefficient times variable², ³ cubic: coefficient times variable³, ⁴ Correlation between pinch strength and the covariates, e.g. pinch strength with age (linear relationship), ⁵ Explained variance of the optimal bivariate model (maximal explained variance) of pinch strength with the covariates, e.g. pinch strength = a₀ + a₁age + a₂age². ⁶ Partial explained variance of the single regression terms within the optimal multivariate model (maximal explained variance).