Table I.

Comparison of the various component scores and total scores of the St. George’s Respiratory Questionnaire for chronic obstructive pulmonary disease (COPD) with gender, age and COPD grade

Parameter	n	Symptom component score	Activity component score	Impact component score	Total score
Gender
Male	86	58.6±21.4	49.4±17.9	43.4±18.9	47.9±16.7
Female	14	56.6±25.0	59.7±20.6	46.6±22.0	52.4±19.8
P	-	<0.752	<0.053	<0.567	<0.364
Age (yr)
45-55	5	42.1±10.5	46.8±18.7	35.1±12.5	39.9±10.7
56-65	13	48.7±15.1	36.1±16.5	24.6±11.0	32.4±10.9
66-75	59	56.0±21.3	48.5±16.0	42.7±17.2b	46.9±14.7b
≥76	23	73.3±20.6a,b,c	66.0±16.5b,c	59.3±17.4a,b,c	63.8±15.6a,b,c
P	-	<0.001	<0.001	<0.001	<0.001
COPD grade
1	20	41.6±15.1	41.3±12.9	28.9±12.4	34.9±8.0
2	40	51.9±16.5	45.4±16.1	36.4±14.2	41.9±12.1
3	21	65.3±20.1x,y	53.6±19.3	52.5±16.9x,y	55.1±15.6x,y
4	19	81.9±16.8x,y,z	69.3±14.7x,y,z	65.5±12.9x,y,z	69.6±11.8x,y,z
P	-	<0.001	<0.001	<0.001	<0.001
Total	100	58.4±21.8	50.8±18.6	43.8±19.2	48.5±17.1
P	-	<0.001	<0.001	<0.001	<0.001

Values are expressed as mean±SD. ^asignificant difference from age 45-55; ^bsignificant difference from age 56-65; ^csignificant difference from age 66-75; ^xsignificant difference from grade 1; ^ysignificant difference from grade 2; ^zsignificant difference from grade 3