Table 2.

Hip extensor muscle group regression equation, model parameters, diagnostic statistics, and group characteristics (mean ± standard deviation)

Equation: $\text{Hip extensor muscle volume}=1087.037+\left(64.946\times \text{body mass}.\text{thigh length}\right)$
	β	Standard error (lower limit–upper limit)	p value
Constant	1087.037	410.022 (193.676–1980.398)	0.021
Body mass.thigh length	64.946	12.554 (37.594–92.298)	< 0.001
R2	0.690
Adjusted R2	0.665
Standard error of the estimate (cm3)	283.01 (8.92%)
Mean cross-validation residual (cm3)	− 347.32 (11.28%)
Durbin–Watson statistic	1.67

	Model-development group	Cross-validation group (range)
Height (m)	1.78 ± 0.05	1.88 (1.80–1.93)
Body mass (kg)	77.8 ± 9.7	80.3 (75.4–84.7)
Thigh length (m)	0.41 ± 0.03	0.45 (0.41–0.47)
Hip extensor muscle volume (cm3)	3171.9 ± 488.7	3078.8 (2810.1–3513.3)

Model-development group n = 14, cross-validation group n = 3