Association between Family Structure and Physical Activity of Chinese Adolescents

Table 2

Family structure frequencies ().

Factors	Family structure subcategories (living with)	Frequencies
Number of parents	Single-parent	44 (7.2%)
	Both parents	562 (91.9%)
	No biological parents	6 (0.9%)
Nature of parents	Biological parents	514 (84.1%)
	Step parents	92 (15%)
	Adopted parents and relatives	6 (0.9%)
Number of grandparents	One or two grandparents	114 (18.6%)
	No grandparents	498 (81.4%)
Number of siblings	One sibling	42 (6.9%)
	No siblings	570 (93.1%)