Assessment of Tear Osmolarity in Smokers Using TearLab and I-Pen Systems

Table 1

Median (IQR) OSDI and osmolarity scores for subjects in the study and control groups.

Parameter	Study group (N = 30)	Control group (N = 30)
OSDI	10.4 (2.0)	6.3 (4.0)	<0.001
TearLab (mOsm/L)	310 (9.5)	287.0 (12.5)	<0.001
I-Pen (mOsm/L)	322.0 (14.0)	298.5 (12.3)	<0.001

^∗Significant difference (Mann–Whitney test; P < 0.001).