Bone Mineral Density and Body Composition of Adult Premenopausal Women with Three Levels of Physical Activity

Table 5

Selected multiple regression results for all three groups (𝑛=48).

Independent variables	BMC (g)	BMD total skeleton (g/cm^2)	BMD lumbar spine (g/cm^2)	BMD femoral neck (g/cm^2)	BMD total hip (g/cm^2)	BMD 33% radius (g/cm^2)
Physical activity and body weight	𝑅^2=0.568	𝑅^2=0.309	𝑅^2=0.323	𝑅^2=0.334	𝑅^2=0.320	𝑅^2=0.200
	𝑃<0.0001	𝑃=0.0002	𝑃=0.0002	𝑃=0.0001	𝑃=0.0002	𝑃=0.0066
Duration of practice and body weight	𝑅^2=0.629	𝑅^2=0.358	𝑅^2=0.345	𝑅^2=0.358	𝑅^2=0.335	𝑅^2=0.236
	𝑃=0.0004	𝑃<0.0001	𝑃<0.0001	𝑃<0.0001	𝑃=0.0001	𝑃=0.0024
Physical activity and BMI	𝑅^2=0.410	𝑅^2=0.272	𝑅^2=0.314	𝑅^2=0.314	𝑅^2=0.332	𝑅^2=0.147
	𝑃<0.0001	𝑃=0.0008	𝑃=0.0002	𝑃=0.0002	𝑃=0.0001	𝑃=0.0275
Duration of practice and BMI	𝑅^2=0.426	𝑅^2=0.302	𝑅^2=0.323	𝑅^2=0.344	𝑅^2=0.347	𝑅^2=0.192
	𝑃<0.0001	𝑃=0.0002	𝑃=0.0002	𝑃<0.0001	𝑃<0.0001	𝑃=0.0083
Physical activity, NFSTM, and fat mass	𝑅^2=0.555	𝑅^2=0.315	𝑅^2=0.317	𝑅^2=0.303	𝑅^2=0.317	𝑅^2=0.195
	𝑃<0.0001	𝑃=0.0008	𝑃=0.0007	𝑃=0.0011	𝑃=0.0007	𝑃=0.0215
Duration of practice, NFSTM, and fat mass	𝑅^2=0.622	𝑅^2=0.346	𝑅^2=0.346	𝑅^2=0.327	𝑅^2=0.329	𝑅^2=0.249
	𝑃<0.0001	𝑃=0.0002	𝑃=0.0003	𝑃=0.0005	𝑃=0.0005	𝑃=0.0052

BMC: total bone mineral content; BMD: bone mineral density; BMI: body mass index; NFSTM: non-fat soft tissue mass. The units of the independent variables are the same indicated in Table 4.
𝑅²: coefficient of determination. Values of 𝑃 correspond to the probability of 𝑅² of attaining the displayed value or a higher one by chance.