Table 6.

Mean difference in SGRQ-CM scores between patients at different levels of disease severity

	Activity Subscale			Impact Subscale			SGRQ-CM Total Score
	Mean Difference (95% CI)	Effect Size	p value	Mean Difference (95% CI)	Effect Size	p value	Mean Difference (95% CI)	Effect Size	p value
GOLD Classification
IV vs III	9.35 (0.05–18.64)	0.34	0.04	12.04 (1.45–22.63)	0.45	0.02	10.78 (1.38–20.17)	0.37	0.02
III vs II	9.51 (2.58–16.43)	0.33	< 0.01	8.91 (1.02–16.79)	0.31	0.00	8.26 (1.27–15.26)	0.28	< 0.01
mMRC Dyspnea grade
IV vs III	14.58 (9.33–19.83)	0.58	< 0.001	5.07 (2.54–12.67)	0.37	0.19	8.59 (2.59–14.59)	0.43	< 0.01
III vs II	8.89 (3.39–14.39)	0.39	< 0.01	10.57 (2.60–18.54)	0.49	0.01	9.86 (3.57–16.15)	0.46	< 0.01

GOLD Global Initiative for Obstructive Lungs disease; GOLD II, FEV1 50 to 80% predicted; GOLD III, FEV1 30 to 50% predicted; GOLD IV, FEV1 < 30% predicted; mMRC modified medical research council dyspnea scale; SGRQ-CM, Malaysian version of St George’s Respiratory COPD specific Questionnaire