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Table 2 Symptom score definitions

From: Clinical validation of controlled exposure to birch pollen in the Environmental Exposure Unit (EEU)



0 = none

Symptom is completely absent

1 = mild

Symptom is present but minimal awareness, easily tolerated

2 = moderate

Awareness of symptoms, bothersome, but tolerable and not interfering with daily activities

3 = severe

Definite awareness of symptoms, difficult to tolerate, interferes with activities; and/or desires treatment

  1. Participants graded each symptom on a 3-point Likert scale (0–3) every 30 min. The total score was added up for a total out of 12 (TNSS) and 24 (TRSS)