Estimated population prevalence of airflow obstruction and spirometric restriction in 19 sites of the BOLD study with good quality spirometry and data on history of tuberculosis (at least five cases)
| Tirana, Albania | Annaba, Algeria | Salzburg, Austria | Vancouver, BC, Canada | Guangzhou, China | London, UK | Tartu, Estonia | Hannover, Germany | Reykjavik, Iceland | Pune, India | Fes, Morocco | Maastricht, the Netherlands | Manila, the Philippines | Nampicuan and Talugtug, the Philippines | Krakow, Poland | Lisbon, Portugal | Cape Town, South Africa | Uppsala, Sweden | Lexington, KY, USA | |
| Subjects n | 939 | 890 | 1253 | 827 | 461 | 675 | 613 | 680 | 757 | 845 | 768 | 590 | 892 | 722 | 526 | 711 | 846 | 547 | 508 |
| Airflow obstruction % | 8.9 | 6.4 | 17.4 | 13.5 | 7.6 | 17.6 | 6.1 | 8.2 | 11.3 | 6.1 | 8.9 | 18.8 | 9.4 | 15.2 | 13.5 | 8.3 | 19.5 | 9.6 | 14.4 |
| Spirometric restriction % | 16.1 | 26.5 | 9.3 | 8.5 | 29.9 | 17.8 | 8.5 | 9.0 | 12.5 | 66.1 | 19.3 | 10.1 | 62.7 | 56.7 | 10.1 | 10.7 | 46.7 | 10.2 | 26.2 |
| Response rate# % | 82.3 | 94.6 | 65.0 | 26.0 | 87.0 | 17.0 | 49.0 | 59.0 | 81.0 | 97.0 | 98.0 | 48.0 | 58.0 | 85.5 | 78.0 | 10.0 | 63.0 | 61.0 | 14.0 |
| Cooperation rate¶ % | 84.0 | 94.6 | 67.0 | 51.0 | 87.0 | 37.0 | 70.0 | 61.0 | 84.0 | 97.0 | 98.0 | 55.0 | 58.0 | 86.2 | 79.0 | 27.0 | 68.0 | 63.0 | 27.0 |
Airflow obstruction was defined as a forced expiratory volume in 1 s/forced vital capacity (FVC) ratio below the lower limit of normal (LLN). Spirometric restriction was defined as an FVC below the LLN. BOLD: Burden of Obstructive Lung Disease. #: denominator comprises people of unknown eligibility status who could not be contacted; only known participants considered ineligible were excluded. ¶: denominator comprises only participants who were contacted and eligible.