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. 2015 Jul-Aug;41(4):331–342. doi: 10.1590/S1806-37132015000004518

Figure 2. Correlations between smoking history and spirometry parameters, showing that pack-years of smoking correlated negatively with percent-predicted FVC (A), percent-predicted FEV1 (B), the percent-predicted FEV1/FVC ratio (D), and the absolute FEV1/FVC ratio (C).

Figure 2