HSS 4303 Lecture Notes - Lecture 11: Cohort Study, Relative Risk, Benzene

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 4303
• Professor: Eric Lavigne

Document Summary

Quantitative study > analytic > observational > case-control, cohort, cross-sectional studies. Measures of association relative risk: used in cohort studies; odds ratio: used in case-control studies; Necessary condition: statement must be satisfied for the statement to be true; before b can be true, a must happen. Sufficient condition: assures the state(cid:373)e(cid:374)t"s truth; (cid:449)he(cid:374)e(cid:448)er a happe(cid:374)s, b (cid:373)ust follow: hiv is necessary to cause aids, but hiv is not sufficient to cause aids (lots of ppl have hiv but not aids) Necessary and sufficient one to one relationship of exposure to disease, rarely occurs. To get a specific disease, you must get specific exposure i. e infection with corona virus h5n1 and development of sars. Sufficient but not necessary one or more factors by themselves can cause the disease radioactivity exposure or benzene exposure can each produce leukemia w/o presence of the other.