Table 1.

Characteristics of study patients.

	Comparison group (n = 14,128)		GERD group (n = 3532)
Variable	n	%	n	%	Chi squared	P value
Sex
Male	7517	53.2%	1880	53.2%	0.0005	.982
Female	6611	46.8%	1652	46.8%
Age, years
20–29	1444	10.2%	361	10.2%	0.0080	1.000
30–39	2748	19.5%	687	19.5%
40–49	3888	27.5%	972	27.5%
50–59	3188	22.6%	797	22.6%
60–69	2380	16.8%	596	16.9%
≥70	480	3.4%	119	3.4%
Comorbidities
Allergic rhinitis
No	7936	56.2%	1984	56.2%	0.0000	1.000
Yes	6192	43.8%	1548	43.8%
Asthma
No	11834	83.8%	2959	83.8%	0.0004	.984
Yes	2294	16.2%	573	16.2%
Adenotonsillitis
No	13592	96.2%	3398	96.2%	0.0000	1.000
Yes	536	3.8%	134	3.8%
Chronic rhinosinusitis
No	12199	86.3%	3049	86.3%	0.0011	.974
Yes	1929	13.7%	483	13.7%
Total	14128		3532

GERD = gastroesophageal reflux disease.