Table 4.

Survey on the time taken by students for sleep and rest.

Survey object	6 to 7 hours		7 to 8 hours		8 to 9 hours		9 to 10 hours		More than 10 hours
	Number	%	Number	%	Number	%	Number	%	Number	%
Elementary school student	49	6	156	19	246	30	303	37	66	8
Junior high school student	205	23	383	43	214	24	27	3	0	0
High school student	495	57	156	18	9	1	0	0	9	1