Table 2 Association between vitamin B2 and infertility.

	Model 1		Model 2		Model 3		Model4
	OR(95%CI)	P value	OR(95%CI)	P value	OR(95%CI)	P value	OR(95%CI)	P value
Vitamin B2	0.86(0.74, 1.002)	0.053	0.81(0.68, 0.97)	0.02	0.81(0.68, 0.96)	0.02	0.81(0.69, 0.96)	0.02
Subgroup
Q1 (< 1.22 mg)	Reference		Reference		Reference		Reference
Q2 (1.22–1.65 mg)	0.75(0.45, 1.26)	0.27	0.70(0.42, 1.18)	0.18	0.71(0.42, 1.19)	0.18	0.72(0.43, 1.21)	0.20
Q3 (1.66–2.15 mg)	0.93(0.62, 1.38)	0.70	0.83(0.55, 1.25)	0.35	0.84(0.55, 1.29)	0.42	0.85(0.56, 1.31)	0.44
Q4 (> 2.15 mg)	0.64(0.43, 0.97)	0.03	0.56(0.37, 0.86)	0.01	0.57(0.37, 0.87)	0.01	0.58(0.38, 0.89)	0.02
Trend test		0.07		0.02		0.02		0.03

OR odd ratio, CI confidence interval. Model 1 was the model without adjustment for covariates. Model 2 was adjusted for age, race, marital status, education level, PIR and marital status. Model 3 was adjusted as for model 1, additionally adjusted for BMI, physical activity, smoking status, drinking status, and HEI-2015. Model 4 was adjusted as for model 3, additionally adjusted for age at menarche, pelvic infection/PID history, use of birth control pills, and use of female hormones.

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