From: Ear diseases among secondary school students in Xi'an, China: The role of portable audio device use, insomnia and academic stress
AIS Score
SHL
Without SHL
Total
Percentage of SHL(%)
Normal
19
1282
1301
1.46
Sleeping disorder
3
257
260
1.15
Insomnia
1
5
6
16.67
23
1544
1567
1.47