Table 4.

Descriptive statistics for variables.

Variable name	Minimum value	Maximum value	Mean	Standard deviation
Physical exercise time	5	115	3	24.11
Mental health level	8	100	70.68	20.28
Gender	6	8	2.03	5.86
Age	1	2	1.5	2.85
Household registration	13	19	14.51	2.98
Only child or not	1	2	1.48	1.5
Family economic level	1	2	1.5	1.49
Parental education level	1	5	2.97	2.4
Emotional connection	3	16	6.34	3.66
Concern for children	2	6	2.23	1.42
School ranking	3	10	5.97	1.75
Availability of health courses	5	16	8.68	4.03
Intrinsic school climate	2	4	3.01	1.89
Self body image assessment	1	2	1.68	1.23
Sleep time	2	6	2.38	1.21