Table 3.

Relationship between parental reproductive age and risk of EBP in offspring [OR (95% CI)].

Paternal age	Model 1				Total	Model 2
	Maternal age			P trend		Maternal age			P trend	Total
	≤26	26–32	>32			≤26	26–32	>32
≤27	1.29 (1.19–1.39)* **	1.00 (0.89–1.12)	0.97 (0.41–2.07)	<0.001	1.27 (1.20–1.34)***	1.18 (1.08–1.29)***	0.96 (0.83–1.10)	1.18 (0.46–2.75)	<0.001	1.18 (1.10–1.26)***
27–30	0.98 (0.89–1.08)	1.00 (ref)	1.12 (0.70–1.75)	0.64	1.00 (ref)	0.96 (0.86–1.07)	1.00 (ref)	0.96 (0.55–1.62)	0.39	1.00 (ref)
>30	0.77 (0.68–0.88)* **	0.86 (0.78–0.94)**	1.35 (1.18–1.54)***	<0.001	0.91 (0.85–0.98)*	0.84 (0.73–0.97)*	0.88 (0.79–0.99)*	1.18 (1.01–1.38)*	0.02	0.93 (0.86–1.02)
P trend	<0.001	0.002	0.29			<0.001	0.21	0.62
Total	1.27 (1.21–1.33)***	1.00 (ref)	1.42 (1.26–1.59)***			1.18 (1.11–1.25)***	1.00 (ref)	1.23 (1.07–1.41)**

Model 1 adjusted for offspring age and sex.

Model 2 adjusted for offspring age, sex, province, school, breastfeeding, birth weight, gestational age, delivery mode, parental history of hypertension, parental highest education degree and offspring lifestyle score.

^*P < 0.05, **P < 0.01, ***P < 0.001.