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Figure 3 | Respiratory Research

Figure 3

From: Female smokers beyond the perimenopausal period are at increased risk of chronic obstructive pulmonary disease: a systematic review and meta-analysis

Figure 3

Weighted analysis of the relationship between age and gender-related differences in the annual decline in FEV 1 % pred for current smokers The regression line is weighted by the numbers of current smokers. The diameter of each circle is proportional to the number of current smokers in each study. Abbreviation: FEV1: forced expiratory volume in one second.

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