Table 3.

Linear Regression Results for the Associations Between Plasma Vitamin D Biomarkers and Relative Telomere Length, Nurses’ Health Study, 1989–1990

Biomarker	No. of Samples	Model 1a		Model 2b
		β (SE)	P for Trend	β (SE)	P for Trend
25(OH)D	1,337	0.006 (0.003)	0.02	0.005 (0.003)	0.05
1,25(OH)2D	794	−0.004 (0.005)	0.38	−0.005 (0.005)	0.32

Abbreviation: 1,25(OH)₂D, 1,25-dihydroxyvitamin D; 25(OH)D, 25-hydroxyvitamin D; SE, standard error.

^a Adjusted for study batch and age in years (continuous).

^b Adjusted for study batch, age in years (continuous), smoking status (0, 0.1–20, 20.1–40, or >40 pack-years), body mass index (weight (kg)/height (m)²) (<25, 25–29.9, 30–34.9, or ≥35), and physical activity level (nominal quartiles measured in metabolic equivalents per week).