Table 3 Individual questionnaire items for the 8‐item predictor and 5‐item discriminant function predictor (DFP)*.

Predictor	Questionnaire item
8‐item predictor	Have you ever had trouble with your breathing? (continuously or repeatedly)
	Have you had an attack/episode of shortness of breath at any time in the last 12 months?
	Have you had wheezing or whistling in your chest at any time in the last 12 months?
	Have you been awakened during the night by an attack of any of the following symptoms in the last 12 months: (a) cough? (b) chest tightness?
	When you are near animals, feathers, or in a dusty part of the house, do you ever get itchy or watery eyes?
	When you are near animals, feathers, or in a dusty part of the house, do you ever get a feeling of tightness in your chest?
	When you are near trees, grass, or flowers, or when there is a lot of pollen around, do you ever get itchy or watery eyes?
5‐item DFP*	Have you ever had trouble with your breathing? (continuously or repeatedly)
	Have you had an attack/episode of shortness of breath that came on following strenuous activity at any time in the last 12 months?
	Have you had wheezing or whistling in your chest at any time in the last 12 months?
	Have you been awakened during the night by an attack of the following symptom in the last 12 months: shortness of breath
	When you are near animals, feathers, or in a dusty part of the house, do you ever get a feeling of tightness in your chest?

*From Burney et al.¹⁵