Table 3—

Mean St George's Respiratory Questionnaire scale scores by demographical and clinical characteristics in the general population weighted sample

	Symptoms	Activity	Impacts	Overall
Sex
M	11.62	12.17	5.23	8.60
F	7.82	14.58	4.26	8.23
p‐value	<0.001	0.043	0.15	0.63
Age yrs
39–49	7.97	9.33	2.69	5.78
50–59	8.74	13.48	4.55	8.19
60–69	12.54	17.95	7.23	11.61
p‐value	<0.001	<0.001	<0.001	<0.001
Education
High school or more	8.54	9.26	3.10	6.05
Primary school or no education	10.45	16.53	6.02	10.20
p‐value	0.03	<0.001	<0.001	<0.001
Social class (occupations)^#
I‐II (professional/intermediate)	9.55	9.46	2.96	6.23
III (skilled nonmanual)	7.92	10.19	3.14	6.27
IV‐V (manual)	10.29	15.93	5.64	9.79
p‐value	0.07	<0.001	<0.001	<0.001
Smoking behaviour
Never smoker	7.49	13.63	4.16	7.81
Former smoker	9.58	13.19	5.50	8.69
Smoker⩽20 pack-yrs	12.99	11.58	3.38	7.76
Smoker>20 pack-yrs	16.12	14.20	6.59	10.76
p‐value	<0.001	0.74	0.04	0.09
% FEV₁ over pred
% FEV₁≥100	5.39	9.33	2.33	5.14
90⩽ % FEV₁<100	8.23	9.17	2.80	6.01
80⩽ % FEV₁<90	9.12	13.94	4.68	8.47
% FEV₁<80	16.20	21.14	9.27	14.30
p‐value	<0.001	<0.001	<0.001	<0.001

M: male
F: female
FEV₁: forced expiratory volume in one second. n=862
^#: social class based on an adaptation of the British Registrar General's Classification 26