TABLE 1.

Summary of Burden of Obstructive Lung Disease (BOLD) study sites included in the analysis

Site	Target population	Sampling design	Respondents# n	Response rate¶ %	Cooperation rate+ %
Guangzhou, China	Residents of the Number Two Community Center of the Liwan district of the city of Guangzhou	Stratified random sample	602	87	87
Adana, Turkey	Residents of all districts (urban and rural) that make up the Adana province	Stratified cluster sample	875	82	85
Salzburg, Austria	Residents of Salzburg County	Stratified random sample	1349	65	67
Cape Town, South   Africa	Residents of the towns of Ravensmead and Uitsig, both located in the general Tygerberg area	Cluster sample	896	63	68
Reykjavik, Iceland	All age-eligible Icelandic citizens living in Reykjavik and surrounding suburbs	Simple random sample	758	81	84
Hanover, Germany	Residents of Hanover city and four of the 20 town councils that make up the rest of Hanover region	Stratified random sample	713	59	61
Krakow, Poland	Residents of the Chrzanów and Proszowice regions within the Malopolska district of Poland	Stratified random sample	603	78	79
Bergen, Norway	Residents of the city of Bergen	Stratified random sample	707	68	71
Vancouver, BC,   Canada	Residents of the Vancouver Health Service Delivery Area of Vancouver	Random digit dialling	856	26	51
Lexington, KY, USA	Residents of the fifth congressional district of Kentucky	Random digit dialling	563	14	27
Manila, Philippines	Residents of one of the six districts that make up the city of Manila	Cluster sample	918	58	58
Sydney, Australia	Residents of the federal electorates, Kingsford Smith and Barton, which make up the southern beachside suburbs of Sydney	Stratified random sample	585	25	33
London, UK	The patients served by three general practitioners from West London, which is broadly representative of the Hammersmith and Fulham neighbourhood of West London	Stratified random sample	697	17	37
Uppsala, Sweden	Residents of the city of Uppsala	Stratified random sample	588	61	63

^#: participants with core questionnaire and any post-bronchodilator spirometry;

^¶: denominator includes persons of unknown eligibility status who could not be contacted (only known ineligible participants were excluded);

⁺: denominator includes only participants who were contacted and eligible.