Refractive errors and ocular findings in children and adolescents with mental disorders: a retrospective study

BMC Ophthalmology

Table 2 Time spent on sleeping and screen-based devices with MDs and controls

Characteristic	MDs group(n=178)	Control group(n=200)	P
Time spent on sleeping
<9 hrs/day	82	79	0.165*
≥9 hrs/day	96	121	0.165*
Time spent on screen-based devices
<2 hrs/day	75	188	P<0.001*
≥2 hrs/day	103	22	P<0.001*

ISSN: 1471-2415