Table 3 Estimated crude odds ratios (cOR) and adjusted odds ratios (aOR) between otitis media, tonsillopharyngitis, and lower respiratory infections in the Oslo Birth Cohort of 10 year old children (n = 3406).

	Otitis media		Tonsillopharyngitis		Lower respiratory infection
	cOR	aOR	cOR	aOR	cOR	aOR
Otitis media	Ref.	Ref.
Tonsillopharyngitis	3.1 (2.6–3.9)	2.8 (2.3–3.5)	Ref.	Ref.
Lower respiratory infection	3.5 (2.7–4.6)	2.9 (2.1–3.8)	2.6 (2.0–3.3)	2.3 (1.3–1.9)	Ref.	Ref.