Serum 25(OH)D Level and Parathyroid Hormone in Chinese Adult Population: A Cross-Sectional Study in Guiyang Urban Community from Southeast of China

Table 4

Multiple factor logistic regression of low serum 25(OH)D of less than 30 ng/mL.

Variables	β (SE)	OR (95% CI)	𝑃 value
Age
20–39 yr	0.613 (0.167)	1.846 (1.332–2.559)	<0.001
40–59 yr	—	—
60–79 yr	0.651 (0.216)	1.918 (1.256–2.929)	0.003
Waist/hip ratio
Normal
Abnormal	0.444 (0.161)	1.559 (1.137–2.138)	0.006
Outdoors activity
<30 min/day	0.290 (0.179)	1.337 (0.941–1.898)	0.105
30–60 min/day	0.401 (0.172)	1.490 (0.970–2.228)	0.050
≥60 min/day	—	—
Smoking
Yes	0.435 (0.211)	1.506 (0.097–2.337)	0.049
No	—	—