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A study is conducted to assess the relationship between smoking status and forced expiratory volume in one second (FEV1). Subjects are randomly selected and categorized based on smoking status. Group A consists of 200 nonsmokers, group B consists of 20 light smokers (1-7 cigarettes per day), group C consists of 20 moderate smokers (8-22 cigarettes per day), and group D consists of 20 heavy smokers (23+ cigarettes per day). FEV1, is quantitatively measured in all participants using properly calibrated office spirometers. Which of the following is the most appropriate statistical method to compare the mean FEV1, results among all 4 groups?
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