Table 2.

Associations of maternal age at delivery with allergic rhinitis and rhinitis symptoms in offspring.

Outcome	Maternal age at delivery, years	AOR (95% CI)a	P
Allergic rhinitis	<25	0.56 (0.28–1.10)	0.093
	25–29	0.91 (0.68–1.23)	0.559
	30–34	Reference	–
	35–39	0.88 (0.64–1.20)	0.406
	≥40	4.58 (1.90–11.03)	0.001
	per 5-year continuous increase	1.18 (1.01–1.39)	0.045
Ever rhinitis	<25	0.58 (0.29–1.18)	0.133
	25–29	0.92 (0.67–1.27)	0.627
	30–34	Reference	–
	35–39	0.86 (0.62–1.19)	0.358
	≥40	3.62 (1.43–9.13)	0.006
	per 5-year continuous increase	1.12 (0.94–1.32)	0.205
Current rhinitis	<25	0.62 (0.30–1.25)	0.180
	25–29	0.87 (0.64–1.19)	0.381
	30–34	Reference	–
	35–39	0.87 (0.63–1.21)	0.405
	≥40	2.26 (1.01–5.08)	0.049
	per 5-year continuous increase	1.10 (0.93–1.30)	0.250
Allergic sensitization	<25	1.03 (0.50–2.12)	0.946
	25–29	0.82 (0.61–1.12)	0.209
	30–34	Reference	–
	35–39	1.09 (0.79–1.52)	0.594
	≥40	2.86 (1.13–7.22)	0.026
	per 5-year continuous increase	1.16 (0.98–1.37)	0.081

AOR: adjusted odds ratio, CI: confidence interval.

^aCovariates included in the adjusted models are child's age, sex, prematurity, birth order, cesarean delivery, pregnancy-related complications, parental allergic diseases, parental ethnicity, parental smoking status, parental education, and household income. P < 0.05 is bold.