2.

身体活动、静坐时间的成分方差矩阵

Compositional variation matrix of time spent in physical activity and sedentary behavior

Items	Professional population			Nonprofessional population
	MVPA	LIPA	SB	MVPA	LIPA	SB
Abbreviations as in Table 1.
MVPA	0	1.204	1.437	0	0.801	0.941
LIPA	1.204	0	1.043	0.801	0	0.828
SB	1.437	1.043	0	0.941	0.828	0