“…Fourteen studies described COPD prevalence based on GOLD spirometric criteria (17,37,38,(40)(41)(42)47,49,51,53,60,63,65,68), ten on ATS/ERS spirometric criteria (15,36,37,40,43,45,52,62,67,70) while seven studies were on both GOLD and ATS/ERS criteria (46,48,50,52,56,58,70). Five studies utilised the MRC description of chronic bronchitis (39,44,55,59,64) with one reporting both chronic bronchitis (MRC) and COPD (ATS/ERS) criteria (44).…”