Table 3.

Comparison of summer and winter levels of some laboratory parameters and 25-OH vitamin D levels of the groups

Parameters	Groups	Mean	St. Dev.	Parameters	Groups	Mean	St. Dev.
Calcium-Summer (mg/dl)	RA	9.38 a	0.46	25-OH-D-vit-Summer(ng/ml)	21.20	RA	28.85a
	AS	9.43 a	0.38		AS	30.79a	22.86
	OA	9.40 a	0.39		OA	28.62a	17.93
	HC	9.45 a	0.42		HC	30.73 a	18.53
Calcium-Winter (mg/dl)	RA	9.22 a	0.48	25-OH-D-vit-Winter(ng/ml)	RA	29.99a	22.69
	AS	9.35 a	0.38		AS	29.57a	30.47
	OA	9.27 a	0.36		OA	28.05 a	28.06
	HC	9.31 a	0.37		HC	29.82 a	19.19
Phosphorus-Summer(mg/dl)	RA	3.52 a	0.57	CRP-Summer(IU/ml)	RA	16.68 a	20.94
	AS	3.45 a	0.64		AS	12.93 a	14.41
	OA	3.71 a	0.51		OA	5.98 b	5.70
	HC	3.66 a	0.71		HC	3.42 b	1.06
Phosphorus-Winter (mg/dl)	RA	3.32 a	0.60	CRP-Winter (IU/ml)	RA	15.55 a	19.75
	AS	3.40 a	0.61		AS	15.35 a	19.13
	OA	3.58 a	0.60		OA	6.29 b	11.96
	HC	3.47 a	0.54		HC	3.27 b	0.59
PTH-Summer (pg/ml)	RA	53.07 a	25.51	ESH-Summer (mm/h)	RA	25.00 a	16.99
	AS	44.32 a	19.48		AS	15.53 b	14.45
	OA	62.43 a	24.07		OA	15.90 b	10.38
	HC	50.78 a	17.21		HC	7.82 c	6.62
PTH-Winter(pg/ml)	RA	52.21ab	30.59	ESH-Winter (mm/h)	RA	23.54 a	16.12
	AS	42.97 b	22.60		AS	16.66 b	13.66
	OA	62.05 a	24.87		OA	16.85 b	11.84
	HC	48.98 b	21.43		HC	7.69 c	7.65

(Means which get different lower case express statistically significant difference p<0.05)