The Correlation between Matrix Metalloproteinase-9 Point-of-Care Immunoassay, Tear Film Osmolarity, and Ocular Surface Parameters

Table 3

Correlation of MMP-9 grade with ocular surface parameters.

	MMP-9 grade
	R correlation coefficient	value
Osmolarity (mOsmol/L)	0.45	0.027
Schirmer’s test I (mm)	−0.007	0.976
NIBUT (sec)	0.036	0.868
Corneal staining score	0.111	0.607

MMP-9 = matrix metalloproteinase-9; NIBUT = noninvasive tear break up time. Indicates statistical significance ().