Table 2 Factors associated with percent mammographic density, relative telomere length and urinary MDA (multiple regression; n = 305).

Characteristic	Percent Mammographic Density (square root)^a			Relative telomere length^a,b			Urinary MDA (log)^a
Characteristic	Beta	SE	p value	Beta	SE	p value	Beta	SE	p value
Age (years)	−0.003	0.02	0.90	−0.005	0.002	0.02	−0.008	0.006	0.16
Waist Circumference^c (cm)	−679.6	45.0	<0.0001	−6.88	4.62	0.14	16.82	11.5	0.15
Height (cm)	−0.003	0.02	0.85	0.002	0.002	0.30	0.01	0.004	0.004
Age at Menarche (years)	0.04	0.07	0.52	−0.009	0.007	0.21	−0.02	0.02	0.26
Parity (Yes vs no)	−0.20	0.23	0.23	−0.005	0.02	0.83	−0.02	0.06	0.78
Age at First Child (years)	0.06	0.02	0.01	0.002	0.002	0.47	0.007	0.006	0.22
Menopausal Status Post vs Premenopausal	−0.05	0.34	0.88	−0.08	0.05	0.02	0.32	0.09	0.0003
Family History of Breast Cancer Yes vs No	0.10	0.24	0.70	−0.02	0.03	0.43	0.02	0.06	0.77
Current Smoking Smoker vs non smoker	−0.42	0.32	0.19	−0.07	0.03	0.03	0.15	0.08	0.07
Urinary MDA (log)	0.37	0.23	0.10	0.05	0.02	0.02	n/a	n/a	n/a
R square for model	49%			23%			11%

MDA = malondialdehyde; RTL = relative telomere length; SE = standard error; n/a = not applicable.
^aOutcome measure for regression analysis.
^bAdjusted for batch of PCR analysis; ^cNegative inverse transformed.

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