Table 2. Correlation coefficients (r) between vitamin D level and other characteristics.

Characteristics	Vitamin D level (ng/mL)	P-value
Age	-0.003	0.985
BMI	0.134	0.313
Tear size	0.112	0.408
Superior cartilage thickness	0.134	0.314
Middle cartilage thickness	0.111	0.402
Inferior cartilage thickness	0.15	0.257
Total cartilage thickness	0.171	0.195
Fat infiltration	-0.033	0.805
Severity	-0.198	0.134