Table 3.

Correlation analysis between age, diabetes duration, McMonnies questionnaire scores (DEQ), phenol red thread test (PRTT) (mm), tear film interferometry including lipid layer grade, stability (NIBUT), diabetic retinopathy grading, and total neuropathy score (TNS) in those with DM (n = 53).

	Correlation (r values)	Probability (P values)
Age versus NIBUT	−0.28∗	0.05
Age versus TNS	0.41∗∗	0.00
DEQ versus TNS	−0.05	0.73
Lipid layer thickness versus NIBUT	0.56∗∗	0.00
Lipid layer thickness versus PRTT	0.39∗∗	0.00
NIBUT versus diabetes duration	−0.29∗	0.03
NIBUT versus TNS	−0.29∗	0.03
NIBUT versus retinopathy grade	−0.03	0.82
PRTT versus TNS	0.01	0.96
PRTT versus retinopathy grade	−0.16	0.26

∗∗Correlation is significant at the 0.01 level (2-tailed).

∗Correlation is significant at the 0.05 level (2-tailed).