# HSCI 307 Lecture Notes - Lecture 10: Relative Risk, Attributable Risk, Cohort Study

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## Document Summary

Chapter 10 measures of frequency, effect, and outcomes. Prevalence rate: the proportion of people at risk who have a specific condition at a given time, prevalence rate = # of people with the disorder / # of people at risk in a given interval. Time 2, 8/100: point prevalence vs. period prevalence, lifetime prevalence counts the # of people who have ever had the disorder at any time in their lives. Lifetime prevalence can never decrease as people get older; it can only increase or remain the same. Because once a person has a disorder, he or she should have it for life. Incidence rate: looks at only the new cases. Some people already had the condition at the start of the interval (time 2, a b f i. Others developed it during the time frame (time 2, d g) Incidence rate = # or new cases / # or people at risk in a given interval.

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