Table S1. Treatment Recommended by the ARIA Guidelines 4 for the 4 Fictitious Case Scenarios

Table S1. Treatment recommended by the ARIA guidelines 4 for the 4 fictitious case scenarios (* decongestant: a short course (<10 days) of oral or nasal decongestant); ALT: antileukotriene Case 1: Patient, currently untreated, is allergic to house dust mite and suffering from rhinorrhea, sneezing and nasal congestion since 2 months. Symptoms impair the quality of sleep. ARIA classification group Moderate-severe persistent allergic rhinitis

Treatment recommended by ARIA guidelines Nasal corticosteroid +/- H1-antihistamine or ALT+/- decongestant(*) +/- allergen avoidance

Case 2: Patient, currently untreated, with symptoms of sneezing, runny nose, red and tearing eyes since 1 month, especially when working in the garden. Besides these symptoms, the patient has no complaints. ARIA classification group Mild intermittent allergic rhinoconjunctivitis Treatment recommended by ARIA guidelines Oral H1-antihistamine +/- decongestant(*) +/- allergen avoidance Or Nasal H1-antihistamine or ALT + ocular chromone or H1-antihistamine +/- decongestant(*) +/- allergen avoidance Case 3: Patient, currently untreated, allergic to birch, is especially suffering from nasal congestion for the last 2 weeks. The patient is in the middle of exams and his symptoms interfere with studying. ARIA classification group Moderate-severe intermittent allergic rhinitis Treatment recommended by ARIA guidelines Oral or nasal H1-antihistamine or ALT +/- decongestant(*) +/- allergen avoidance Or Decongestant(*) +/- allergen avoidance Or Nasal corticosteroid +/- decongestant(*) +/- allergen avoidance

Case 4: Patient with severe symptoms of allergic rhinitis due to house dust mite for many years. Current treatment with oral antihistamine provides insufficient symptom relief. ARIA classification group Moderate-severe persistent allergic rhinitis, step-up treatment oral antihistamine Treatment recommended by ARIA guidelines Nasal corticosteroid +/- decongestant(*) +/- allergen avoidance Or Nasal corticosteroid + oral or nasal H1-antihistamine or ALT +/- decongestant(*) +/- allergen avoidance Table S2. Treatment modalities selected in 4 case scenarios of allergic rhinitis.

Treatments consistent with the ARIA guidelines [4] are in bold

Clinical scenario 1 % (n)

Selected treatment or combination of treatments

AA + OAH/NAH + NGCS 38.3 % (134)

OAH/NAH + NGCS 16.3% (57)

AA + OAH/NAH + ODC/NDC + NGCS 9.7% (34)

AA + NGCS 9.1% (32)

OAH/NAH + ODC/NDC + NGCS 5.7% (20)

NGCS 4.6% (16)

AA + OAH/NAH 3.1% (11)

AA + OAH/NAH + ODC/NDC 3.1% (11)

OGCS 1.7% (6)

OAH/NAH + ODC/NDC 1.4% (5)

OAH/NAH 1.4% (5)

AA + ODC/NDC + NGCS 0.8% (3)

IT 0.6% (2)

AA + NGCS + LTRA 0.3% (1)

OAH + NGCS +LTRA +/- AA 0.6% (2)

Other 3.1% (11)

Consistent with ARIA recommendations 84.8% (297)