Table 4. Relationship between vitamin D and laboratory parameters among studied ankylosing spondylitis patients (n=40).

	Vitamin D (ng/mL)
	Deficient (n=31)	Insufficient (n=9)
	Mean±SD	Mean±SD	Mann-Whitney test	p
Disease duration (year)	11.9±4.7	5.2±1.0	3.83	<0.001
Total cholesterol level (mg/dL)	160.6±18.1	146.0±16.9	2.12	0.03
Triglycerides	130.3±28.1	100.9±32.6	2.28	0.02
Low-density lipoproteins	103.2±10.6	87.9±6.4	3.58	<0.001
High-density lipoproteins	40.5±5.5	48.1±4.1	3.17	0.002
Carotid intima-media thickness (mm)	0.6±0.1	0.6±0.0	3.51	<0.001
BASDAI	5.5±1.0	4.0±0.6	4.23	<0.001
BASFI	53.2±10.5	37.7±5.1	3.63	<0.001
BASMI	4.7±0.7	4.1±0.6	2.27	0.02
Visual analog scale	7.4±0.8	5.7±0.7	3.97	<0.001
SD: Standard deviation; BASDAI: Bath ankylosing spondylitis disease activity index; BASFI: Bath ankylosing spondylitis functional index; BASMI: Bath ankylosing spondylitis metrology index.