Table 4 Mean asthma symptom score and asthma step by age, year, and group: adults.

	1999		2000		2001		Change 1999–2000 (where both available)		p Value changes,
	I	C	I	C	I	C	I	C	I v C
Number	20	25	18	20	9	19	14	13
Breathless on exercise	3.7	3.8	3.3	3.2	3.3	3.0	–0.3	–0.6	0.62
Breathless not on exercise	2.6	2.0	2.0	2.1	2.2	2.0	–0.6	+0.2	0.38
Wheeze day	2.3	2.6	2.2	2.7	2.4	2.3	–0.4	+0.4	0.26
Wheeze night	2.9	2.2	2.5	2.0	2.7	2.3	–0.6	+0.1	0.38
Cough day	2.5	2.4	2.2	2.8	3.0	2.4	–0.4	+0.3	0.30
Cough night	2.4	2.0	2.5	2.7	2.9	2.5	–0.1	+0.7	0.14
Summed score	16.4	15.0	14.7	15.4	16.6	14.3	–2.3	+1.1	0.006

C, control; I, intervention.