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. 2016 Jan 13;149(6):1419–1427. doi: 10.1016/j.chest.2015.10.067

Figure 4.

Figure 4

Abnormal lung function by smoking status. The proportions of firefighters by smoking status, at each 1.5- to 2.5-year interval, who had an FEV1 measurement less than the lower limit of normal (A) or less than 70% predicted (B).