LAUSR

debates whether GOLD 2017 classification is better than old spirometric classification. Gedebjerg et al. showed that GOLD 2017 classification does not predict mortality more accurately than 2007. Data from PLATINO study showed that GOLD 2007 classification shows more stability over time compared with GOLD 2013. Recently, Candemir et al. investigated whether there was a difference between GOLD 2017 classification and 2007 in clinical variables in patients with COPD. Interestingly, similar values of FEV1 were found between group A and C. Also, mean FEV1 was not different at all between B and D. Moreover, group A and C showed similar result of incremental shuttle walk test (ISWT). On the contrary, GOLD 2007 classification was well correlated with many clinically important variables such as dyspnea, quality of life, anxiety scores, body mass index, fat free mass index, and ISWT. These previous results showed that still FEV1 (%) is good and useful markers for classification of COPD. It is not yet concluded whether removal of FEV1 in GOLD 2017 was good decision or not. However, as the Candemir et al. mentioned, GOLD 2017 classification might not represent the severity of COPD sufficiently well. Probably the combination of both spirometric stage and combined assessment of GOLD 2017 is important, especially for estimating clinical variables.