TABLE 3.

A. Contribution of peak strain score and other factors to selected peripheral quantitative computed tomography strength measures at the distal tibia (N = 239).^†

Contributors	Polar Moment of Inertia	Strength–Strain Index
Model R2	0.346**	0.301**
Peak strain score	–0.126*	–0.132*
Body mass	0.287**	0.258**
Leg length	0.382**	0.354**

B. Contribution of physical activity scores and other factors to selected peripheral quantitative computed tomography strength measures at the distal tibia among the subjects at Iowa State University only (N = 122).†‡
Contributors	Polar Moment of Inertia	Strength–Strain Index
Using peak strain score
Model R2		0.335**
Peak strain score	NS	–0.194*
Body mass		0.175*
Leg length		0.426**
Using hip BLE score
Model R2	0.385**	0.339**
Hip BLE score	–0.181*	–0.208*
Body mass	0.231**	0.175*
Leg length	0.417**	0.393**

^*P < 0.05

^**P < 0.01.

NS, not significant.

^†Values are standardized regression coefficients. Models were generated using multiple linear regression analysis and accounted for calcium and vitamin D intake, body mass, leg length, age, and years since menopause. Only outcome variables for which a physical activity scoring method was a significant contributor are shown.

^‡Total activity score was not a significant contributor to any measure at the distal tibia.

BLE, bone-loading exposure.