Table 2. Description of quantitative characteristics assessed in patients.

Variables	Mean	St. Dev.	Median	Minimum	Maximum	N
Age (years old)	61.5	15.2	64	23	83	29
BMI (Kg/m2)	27.6	3.8	27.58	20.3	35.4	29
WOMAC	51.4	20.8	54	8	88	27
VAS	6.4	3.1	7	1	10	27
Ca2+ (mg/dl)	9.2	1.0	9.3	4.8	10.3	29
P (mg/dl)	3.4	0.5	3.3	2.2	4.6	29
AP (U/l)	85.9	40.3	77	4	222	29
PTH (pg/ml)	68.9	42.9	52	18	199	23
Vit. D (ng/ml)	22.2	7.8	21	9	41	24