HSCI 212 Lecture Notes - Lecture 4: Cumulative Incidence

• School: Simon Fraser University
• Department: Health Sciences
• Course: HSCI 212
• Professor: neinkevanhouten

Document Summary

Infectious disease= leading cause of deaths. when combined with respiratory it is #1 cause of death. Infectiousness: when a person is actually infectious. Dynamics of the disease: what the person is actually experiencing person may not be feeling disease symptoms but will actually be infectious. Slide 19: know equations (don"t have to memorize formulas) Case: single person with infectious disease. usually standard set of criteria that determines whether someone has a disease or not. Risk factor: increases chance of getting disease. smoking would be a risk factor in getting lung cancer. Prevalence = the number of existing cases of a disease at a point in time. Numerator: number of people who are ill, who have specific symptoms, or who have microbiological evidence of infection but remain asymptomatic. # of person-years when people were at risk of: the numerator does not differ between the two types of incidence measures but the denominator does differ. developing the disease.