Table 4.

Logistic Regression Results for the Association Between 25-Hydroxyvitamin D Level and Relative Telomere Length^a, Nurses’ Health Study, 1989–1990

Quartile of 25(OH)D Level	25(OH)D Level, ng/mLb	Model 1c			Model 2d
		OR	95% CI	P Value	OR	95% CI	P Value
1 (referent)	15.4	1.00	Referent		1.00	Referent
2	24.7	1.10	0.82, 1.48	0.53	1.07	0.79, 1.45	0.65
3	32.3	1.38	1.00, 1.91	0.05	1.34	0.96, 1.87	0.08
4	43.0	1.67	1.18, 2.36	0.004	1.59	1.11, 2.29	0.01

Abbreviations: 25(OH)D, 25-hydroxyvitamin D; CI, confidence interval; OR, odds ratio.

^a Telomere length was dichotomized at the median.

^b Median values for each quartile.

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

^d 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).