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. Author manuscript; available in PMC: 2011 May 1.
Published in final edited form as: Am J Med. 2010 May;123(5):468.e1–468.e7. doi: 10.1016/j.amjmed.2009.07.037

Figure 1.

Figure 1

A. FEV1 change with age in participants with (open circles) and without (solid circles) airflow obstruction at study entry (Year 0). The decline in FEV1 was 18 ml/yr in the participants without airflow obstruction and 14 ml/yr in those with airflow obstruction at study entry (P=0.005). B. FEV1 change with age in participants with and without airflow obstruction at study entry and subdivided by never or ever smoking. Rates of change in FEV1 were computed with ages 24 and lower truncated from the GEE model. *p=0.01 compared to the participants with airflow obstruction who were never smokers.