Table 6.

Utility weights by GOLD state and type of exacerbation

Event/GOLD	CAN/UK			ESP			SWE
	II	III	IV	II	III	IV	II	III	IV
No Ex	0.79	0.75	0.65	0.82	0.72	0.57	0.73	0.74	0.52
Non-SevEx	0.77	0.74	0.64	0.81	0.71	0.56	0.72	0.73	0.51
SevEx	0.74	0.70	0.61	0.78	0.69	0.54	0.69	0.70	0.49

Notes: Weights for mild and moderate exacerbations were merged (averaged) if necessary to form “nonsevere exacerbation”. Utility weights were derived using the EQ-5D questionnaire. Data from Hettle et al²⁶ (CAN/UK), Miravitlles et al⁴⁹ (ESP), and Stahl et al⁵⁰ (SWE).

Abbreviations: GOLD, Global Initiative for Chronic Obstructive Lung Disease; GOLD II, GOLD classification indicating moderate COPD; COPD, chronic obstructive pulmonary disease; GOLD III, GOLD classification indicating severe COPD; GOLD IV, GOLD classification indicating very severe COPD; CAN, Canada; ESP, Spain, SWE, Sweden; No Ex, no exacerbation; Non-SevEx, nonsevere exacerbation; SevEx, severe exacerbation; EQ-5D, Euroqol 5 dimension.