Table 2. Predictors^* of serum FOLR1 concentrations.

Predictor	df†	Full Model	Reduced Models
		P value	P value	P value
Age	2	0.09	–	–
Gender, female vs male	1	0.003	0.003	0.003
Vitamin A intake, >2000 vs ≤2000 µg/d	1	0.34	0.03	0.03
Oral contraceptive use, ever vs never	1	0.04	0.07	–
Folate intake	1	0.94	–	–
BMI	1	0.08	–	–
Breast feeding	2	0.26	–	–
Pregnancy	1	0.05	–	–
Smoking	2	0.37	–	–
Total energy, kcals/d	1	0.60	–	–
Alcohol	1	0.87	–	–
Hormone replacement use	1	0.80	–	–
Model R2		0.44	0.24	0.20
Model P value		0.04	0.001	0.001

*P values are from Type III sum of squares obtained from general linear regression models.

^†degrees of freedom.