Table 2

Demographic characteristics by disease group, North Carolina School Asthma Survey, 1999

		Undiagnosed frequent wheezers	Diagnosed current asthmatics	Asymptomatic	Infrequent wheezers
Subjects n*		7587	12174	64644	38424
Sleep disturbances at night due to	<1 night per week	30	35	2	15
wheezing in the last 4 weeks	≥1 nights per week	17	15	0	4
Limited activities due to wheezing	<1 time per week	23	33	1	10
in the last 12 months	≥1 times per week	10	14	0	2
	Almost daily	5	5	0	1
Any school days missed due to	<1 day per month	15	24	2	38
wheezing in the last 12 months	1–3 days per month	8	14	1	3
	≥1 days per week	5	8	0	1
Physician visits due to wheezing	1–2 visits	25	44	4	19
in the last 12 months	3–4 visits	5	18	0	3
	5+ visits	3	9	0	1
Emergency room visits due to	1–2 visits	7	22	1	4
wheezing in the last 12 months	3–4 visits	1	5	0	0
	5+ visits	2	3	0	0
Hospitalisations due to wheezing	1–2 visits	7	18	0	3
in the last 12 months	3–4 visits	1	3	0	0
	5+ visits	2	2	0	0
Inhaled medicine use in the last	<1 per month	5	19	1	6
12 months	1–3 days per month	3	20	0	2
	≥1 times per week	2	16	0	1
	Almost every day	3	22	0	2