Table 2

Number of subjects, and the corresponding percentage, in relation to the presence of symptoms

	Non-smokers				Exsmokers				Smokers
	No symptoms	Symptoms	Missing	Percentage with symptoms	No sympt oms	Symptoms	Missing	Percentage with symptoms	No symptoms	Symptoms	Missing	Percentage with symptoms
Cough usually in the morning during winter	85	0	11	0	149	9	22	6	89	29	36	25
Cough usually day or night during winter	88	0	8	0	145	4	31	3	85	17	52	17
Cough most days at least 3 months a year or more during winter	88	0	8	0	147	6	27	4	89	29	36	25
Cough and expectoration usually in the morning	85	2	9	2	136	11	33	7	81	31	42	28
Cough and expectoration usually day or night in winter	88	2	6	2	143	3	34	2	103	10	41	9
Cough and expectoration most days 3 months a year or more	90	2	4	2	148	8	24	5	88	23	43	21
Wheeze or squeaks any time	71	9	16	11	91	40	49	31	44	64	46	59
Wheeze or squeaks any time connected with a common cold	80	4	12	5	127	17	36	12	65	37	52	36
Wheeze or squeaks any time unconnected with a common cold	92	0	4	0	147	6	27	4	90	22	42	20
Wheeze or squeaks most days a year	94	0	2	0	170	2	8	1	131	3	20	2
Dyspnoea when walking fast on the level or walking up an incline	82	1	13	1	118	15	47	11	97	17	40	15
Dyspnoea when walking on the level at ordinary pace	92	0	4	0	164	4	12	2	139	0	15	0