Table 4.

Correlations among the TF grades obtained from non-stimulated and stimulated tears

Test/Correlation	Non-stimulated tears		Stimulated tears
TF (OD)	TF (OS)	TF (OD)	TF (OS)
Non-stimulated tears
TF (OD)
r	1	0.554*	0.275	0.291
P	—	0.007	0.094	0.076
TF (OS)
r	0.554*	1	0.262	0.275
P	0.007	—	0.112	0.095
Stimulated tears
TF (OD)
r	0.275	0.262	1	0.491*
P	0.094	0.112	—	0.002
TF (OS)
r	0.291	0.275	0.491*	1
P	0.076	0.095	0.002	—

Note: *Correlation is significant at the 0.01 level (2-tailed). TF patterns were graded using 0.1 increments.

Abbreviations: r, Spearman correlation coefficient; P, significance; TF, tear ferning; OD, right eye; OS, left eye.