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FEV1 with subgroups of the number of natural teeth in patients with airflow obstruction.
Notes: Although there were no significant differences in both sexes, FEV1 showed a decreasing trend in the groups with 20–27 teeth and <20 teeth compared with the 28-teeth group after adjustment for confounding factors (age, smoking, drinking, exercise, income, education, and BMI).
Abbreviations: FEV1, forced expiratory volume in 1 second; BMI, body mass index.
