Table 2.

Primary outcome variables of tear film break up time (BUT) and Schirmer scores (Schirmer II) in the subject groups

Symptoms	Clinical findings	Schirmer II test (mm)	BUT (s)
Normal	Normal	22.0 (2.0–30.0)	12.5 (0.0–30.0)
Discrepancy		15.0 (0.0–30.0)	9.0 (0.0–30.0)
DE	DE	5.0 (0.0–30.0)	4.0 (0.0–20.0)

There were remarkable differences in the values obtained for Schirmer II testing and tear film BUT among our three study groups (Schirmer II test: χ²=422.93, p<0.0001; BUT: χ²=264.85, p<0.0001).

DE, dry eye.