Table 3.

Multivariable Linear Regression Models of the Relationship Between Serum 25(OH)D, PTH, and FEV₁, FVC, and FEV₁/FVC, Respectively, Among Women in WHAS I^*

	Model 1, Vitamin D but Not PTH		Model 2, PTH but Not Vitamin D		Model 3, Both Vitamin D and PTH
Characteristic	β (SE)	p Value	β (SE)	p Value	β (SE)	p Value
FEV1 as dependent variable
Log 25(OH)D (ng/mL)	0.039 (0.017)	.03			0.038 (0.018)	.03
Log PTH (ng/mL)			−0.018 (0.018)	.34	−0.015 (0.019)	.42
FVC as dependent variable
Log 25(OH)D (ng/mL)	0.032 (0.023)	.15			0.031 (0.023)	.18
Log PTH (ng/mL)			−0.014 (0.024)	.33	−0.015 (0.024)	.53
FEV1/FVC as dependent variable
Log 25(OH)D (ng/mL)	0.011 (0.005)	.03			0.011 (0.005)	.04
Log PTH (ng/mL)			−0.006 (0.006)	.27	−0.004 (0.005)	.41

Notes: FEV₁, forced expiratory volume in one second; FVC, forced vital capacity; WHAS I, Women’s Health and Aging Study I.

^*All models adjusted for age, race, education, smoking, height, physical activity, Mini-Mental State Examination score, IL-6, anemia, congestive heart failure, peripheral artery disease, and stroke.