Table 3.

Burden of asthma triggers.

		Patient groups by trigger numbers
	Total N n = 1202	Very few (1–5) n = 156	Low (6–10) n = 293	Medium (11–15) n = 335	High (16 +) n = 418	Kruskal–Wallis
Mean number of severe attacks  in lifetime	3.2 (median 2, range 0–99)	2.0 (median 1, range 0–15)	2.7 (median 2, range 0–99)	2.6 (median 2, range 0–20)	4.6 (median 2, range 0–99)	<0.001
Mean number of times hospitalised  in the last year	0.7 (median 0, range 0–25)	0.5 (median 0, range 0–7)	0.5 (median 0, range 0–6)	0.8 (median 0, range 0–25)	0.8 (median 0, range 0–20)	0.038
Mean days missed at work or study  in the last year because of asthma	7.9 (median 2, range 0–365)	2.9 (median 1, range 0–80)	6.1 (median 2, range 0–288)	6.3 (median 2, range 0–265)	12.2 (median 2, range 0–365)	<0.001