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972 (p0.01). The relationship between the post-bronchodilator FEV1/FVC ratio and FEV1/FEV6 ratio (linear regression analysis) was found out as FEV1/FVC=-1.845+1.009(FEV1/FEV6). Using this formula, the post-bronchodilator FEV1/FEV6 value of 71.845 was obtained corresponding to the post-bronchodilator FEV1/FVC value of 70.00. We found a positive correlation coefficient (r=0.972, p0.001) between the FEV1/FEV6 and FEV1/FVC ratios and the cut off value of 71.845 (p0.01) for the post-bronchodilator FEV1/FEV6 ratio for the diagnos