Determination of vitamin D and analysis of risk factors for osteoporosis in patients with chronic pain

Table 9 Univariate analysis of multiple factors in the osteoporosis and normal bone mineral density subgroups of the study group

Factor	Osteoporosis, (%)	Normal BMD (%)	c2	P value
Age (yr)			49.365	0.000
< 45	1	27
45-64	19	24
≥ 65	35	4
Sex			4.583	0.032
M	10	20
F	45	35
Ethnicity			9.913	0.019
Tibetan	2	10
Han	38	37
Hui	8	7
Others	7	1
BMI			0.777	0.855
< 18.5	5	4
18.5-23.9	36	33
24-27	9	11
> 28	5	7
Occupation
Farmer	10	15	1.294	0.255
Non-farmer	45	40
Vitamin D			0.959	0.811
< 10	19	15
10-20	29	32
20-30	6	6
≥ 30	1	2
PTH			0.767	0381
< 15	0	0
15-65	39	43
> 65	16	12
Ca			0.146	0.703
< 2.2	28	26
2.2-2.7	27	29
> 2.7	0	0
P			1.942	0.379
< 0.85	7	3
0.85-1.51	46	49
> 1.51	2	3
Altitude			6.381	0.041
1500-2500	49	40
2500-3500	6	11
3500-5800	0	4

BMD: Bone mineral density; PTH: Parathyroid hormone; BMI: Body mass index; M: Male; F: Female.