From: Rhinosinusitis in morbidity registrations in Dutch General Practice: a retro-spective case-control study
Comorbidity
Odds ratio
95 % CI
Viral infection (without fever)
1.57
1.53–1.62
Allergic rhinitis
2.88
2.70–3.07
Dental infections
1.40
1.29–1.52
Asthma
1.46
1.38–1.54
Nasal polyps
5.58
4.46–6.97