TABLE 6.

Distribution characteristics of physical exercise of primary and middle school students in Tianjin.

Genders		Number	Percentage (%)
Boys	Do not participate in physical exercise, and intend to participate in later	4	3.8
		7	6.7
	There is no fixed exercise time.	56	53.3
	Doing exercise 1–2 times a week	14	13.3
	Doing exercise three times a week, 30 mins each time	24	22.9
		11	6.3
Girls	Do not participate in physical exercise, intend to participate in later	14	8
	There is no fixed exercise time.	114	65.1
	Doing exercise 1–2 times a week	19	10.9
	Doing exercise three times a week, 30 mins each time	17	9.7