Table 5.

The correlation between ocular surface parameters and the apnea hypopnea index.

	R	P
OSDI score	0.103	0.156
TMH	0.102	0.305
fNIBUT	−0.245	0.013**
avNIBUT	−0.253	0.010*
BRI	0.268	0.006**
LLG	−0.267	0.006**
LRUE (%)	0.197	0.046*
LRLE (%)	0.062	0.534
CFS	0.263	0.007**
Schirmer I	−0.366	<0.001***

OSDI, ocular surface disease index; TMH, tear meniscus height; fNIBUT, first non-invasive breakup time; avNIBUT, average non-invasive breakup time; LLG, lipid layer grading; BRI, bulbar redness index; LRUE, loss ratio of the upper eyelid; LRLE, loss ratio of the lower eyelid; CFS, corneal fluorescein staining; R, Spearman's correlation coefficient, −1 ≤ R ≤ 1; P: Spearman's correlation analysis significance value.

^* P-value < 0.05;

^** P-value < 0.01;

^***P-value <0.001.