Table 1. Descriptive statistics with mean and standard deviation on vitamin D, ionized calcium and PTH in respect to decade of age and gender.

	Vitamin D ng/ml				Calcium mg/dl				PTH pg/ml
Variables	N	Mean	SD	p	N	Mean	SD	p	N	Mean	SD	p
All cases	7544	27.20	16.76		415	4.90	0.36		611	66.73	51.12
All cases M	1917	34.45	21.56	0.000	120	4.49	0.42	0.148	94	67.06	43.89	0.494
All cases F	5627	28.42	14.45		295	4.88	0.32		517	64.88	80.28
decade 1: age 0 to 10 years	1199	45.31	26.89		74	5.15	0.32		28	65.52	107.98
decade 1 M	694	45.73	27.78	0.523	43	5.09	0.36	0.080	19	78.78	129.40	0.024
decade 1 F	505	44.74	25.64		31	5.22	0.26		9	37.52	19.40
decade 2: age 11 to 20 years	564	25.52	10.47		58	4.89	0.42		24	28.95	18.52
decade 2 M	285	25.39	9.71	0.770	26	5.00	0.22	0.054	11	33.75	13.99	0.108
decade 2 F	279	25.65	11.20		32	4.80	0.52		13	24.90	21.34
decade 3: age 21 to 30 years	573	26.13	10.78		41	4.86	0.14		39	56.64	42.77
decade 3M	121	25.81	10.47	0.711	10	4.91	0.17		14	73.94	58.28	0.067
decade 3 F	452	26.21	10.87		31	4.85	0.13	0.276	25	46.96	28.00
decade 4: age 31 to 40 years	1077	26.77	12.33		58	4.84	0.22		68	53.86	25.13
decade 4 M	209	28.92	13.59	0.010	12	4.88	0.21	0.501	7	37.90	9.98	0.231
decade 4 F	868	26.26	11.95		46	4.83	0.22		61	55.69	25.73
decade 5: age 41 to 50 years	1189	27.58	12.80		70	4.87	0.25		94	61.33	45.91
decade 5 M	226	32.20	17.93	0.000	13	4.87	0.18	0.861	10	80.59	118.04	0.000
decade 5 F	963	26.50	10.99		57	4.86	0.27		84	59.04	28.30
decade 6: age 51 to 60 years	1388	27.85	11.73		63	4.82	0.47		168	71.41	50.81
decade 6 M	171	29.02	12.70	0.196	10	4.41	1.04	0.174	16	45.09	26.86	0.219
decade 6 F	1217	27.69	11.58		53	4.90	0.20		152	74.18	51.99
decade 7: age 61 to 70 years	1030	27.83	12.00		35	4.77	0.43		134	78.22	52.33
decade 7 M	130	27.79	12.23	0.966	5	4.84	0.13	0.467	12	65.14	72.23	0.850
decade 7 F	900	27.84	11.98		30	4.76	0.46		122	79.51	50.17
decade 8: age 71 to 80 years	480	25.72	12.60		12	4.99	0.43		52	73.66	41.84
decade 8M	73	26.06	13.25	0.806	1	5.52		NA	5	124.19	51.96	0.190
decade 8 F	407	25.65	12.49		11	4.94	0.42		47	68.29	37.41
decade 9: age 81 to 90 years	44	22.16	15.26		4	4.86	0.20		4	74.39	29.07
decade 9 M	8	18.55	10.25	0.343	0			NA	0			NA
decade 9 F	36	22.96	16.17		4	4.86	0.20		4	74.39	29.07

N = number of assessments; SD = standard deviation; p value from Student T test.