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Unformatted text preview: PH 630 – Epidemiology Ch. 14 & 15 Homework Chapter 14 1) In a large case-control study of patients with pancreatic cancer, 17% of the patients were found to be diabetic at the time of diagnosis, compared to 4% of a well-matched control group (matched by age, sex, ethnic group, and several other characteristics) that was examined for diabetes at the same time as the cases were diagnosed. It was concluded that the diabetes played a causal role in the pancreatic cancer. This conclusion: Ans.: (c) May be incorrect because of failure to establish the time sequence between onset of the diabetes and diagnoses of pancreatic cancer Justification : 2) An investigator examined cases of fetal death in 27,000 pregnancies and classified mothers according to whether they had experienced sexual intercourse within 1 month before delivery. It was found that 11% of the mothers of fetuses that died and 2.5% of the mothers of fetuses that survived had had sexual intercourse during the period. It was concluded that intercourse during the month preceding delivery intercourse during the period....
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- Spring '08
- Epidemiology, Confounding, Combined oral contraceptive pill