Standardized regression coefficients (β), level of significance (p) and coefficient of determination (R²) for proximal femur sub-region models, adjusted for Tanner stage, body height, and body lean mass, with data for boys and girls treated separately.

<p>PA - physical activity; BMD – bone mineral density; FN BMD - femoral neck BMD; TR BMD - trochanter BMD; IT BMD - intertrochanter BMD; FNTR – BMD ratio of femoral neck for trochanter; FNIT – BMD ratio of femoral neck for intertrochanter; TRIT- BMD ratio of trochanter for intertrochanter; BLM – body lean mass.</p

Standardized regression coefficients (β), level of significance (p) and coefficient of determination (R²) for proximal femur sub-region models, adjusted for sex, Tanner stage, body height and body lean mass, with data for boys and girls pooled together.

<p>BMD – bone mineral density; FN BMD - femoral neck BMD; TR BMD - trochanter BMD; IT BMD - intertrochanter BMD; PA - physical activity; MVPA – moderate-through-vigorous PA; BLM – body lean mass.</p

Characteristics of participants as mean±standard deviation.

*<p>Student’s t-test comparing boys to girls was performed when both variables have normal distribution with the same variance. In cases of no normality or no homogeneity of variances, Mann-Whitney nonparametric test was used.^aGirl’s variable without normal distribution; ^bBoy’s variable without normal distribution. PA - physical activity BMD – bone mineral density.</p

Effects of 10 minutes per day of additional physical activity on femoral neck, trochanter, and intertrochanter BMD, adjusted for Tanner stage, body height, and body lean mass.

<p>PA – physical activity; BMD – bone mineral density; FN - femoral neck; TR - trochanter; IT – intertrochanter; ns – non-significant regression coefficient.</p