Assessment of Tear Film Quality among Smokers Using Tear Ferning Patterns

Table 3

Correlation between McMonnies questionnaire scores, PRT, TBUT, and TF grades within nonsmoker subjects ().

Test/correlation		McMonnies	PRT	TBUT	TF
McMonnies	PC	1	−0.070	−0.274	0.195
	Sig.	—	0.715	0.143	0.301
PRT	PC	−0.070	1	0.001	−0.095
	Sig.	0.715	—	0.997	0.616
TBUT	PC	−0.274	0.001	1	−0.187
	Sig.	0.143	0.997	—	0.323
TF	PC	0.195	−0.095	−0.187	1
	Sig.	0.301	0.616	0.323	—

PC: Pearson correlation, Sig.: significance (2-tailed).