16. In a study concerned with the possible effects of air pollution on the development of chronic bronchitis, the following data were obtained. A sample population of 8,524 men who lived in a city with high levels of air pollution was examined in January 2012. At the initial visit for the study, 352 men were found to have chronic bronchitis and were excluded from further study. The bronchitis-free men in the study were followed for 5 years, and 618 new cases of chronic bronchitis occurred during that time. The men who were followed during the study contributed 28,947 years of person-time. What is the cumulative incidence of chronic bronchitis over the 5-year study, expressed as a percentage? Round to the nearest whole number. Include only the numerical answer (no units) in the answer box.
16.
In a study concerned with the possible effects of air pollution on the development of chronic bronchitis, the following data were obtained. A sample population of 8,524 men who lived in a city with high levels of air pollution was examined in January 2012. At the initial visit for the study, 352 men were found to have chronic bronchitis and were excluded from further study. The bronchitis-free men in the study were followed for 5 years, and 618 new cases of chronic bronchitis occurred during that time. The men who were followed during the study contributed 28,947 years of person-time.
What is the cumulative incidence of chronic bronchitis over the 5-year study, expressed as a percentage? Round to the nearest whole number. Include only the numerical answer (no units) in the answer box.
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