Table 1.

Descriptive statistics of socio-demographic variables.

Variable	Categories	Number	Percentage (%)
Gender	Male	270	67.3
	Female	131	32.7
Grade	Sophomore	180	44.9
	Junior	158	39.4
	Senior	63	15.7
Body Mass Index (BMI)	<18.5	64	16.0
	18.5–24.9	267	66.6
	25.0–29.9	54	13.5
	30.0 or above	16	4.0
Academic performance (hundred-mark system)	90 or above	24	6.0
	89–80	213	53.1
	79–70	137	34.2
	69 or below	27	6.7
Monthly expenditure (RMB)	More than 3000	14	3.5
	2000–3000	71	17.7
	1000–2000	256	63.8
	<1000	60	15.0
Exercise frequency (times per week)	0	156	38.9
	1–2	154	38.4
	3–5	64	16.0
	6 or above	27	6.7