Labdis 1. Confounding and stratification: procedural knowledge Set. (Questions 1-9). A case-control study was conducted

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Labdis 1 Confounding And Stratification Procedural Knowledge Set Questions 1 9 A Case Control Study Was Conducted 1 (80.87 KiB) Viewed 99 times

Labdis 1 Confounding And Stratification Procedural Knowledge Set Questions 1 9 A Case Control Study Was Conducted 2 (67.13 KiB) Viewed 99 times

Labdis 1. Confounding and stratification: procedural knowledge Set. (Questions 1-9). A case-control study was conducted to assess the relationship between alcohol consumption (ALC) and oral cancer (OCA). The table describing the crude data is below Table 1 (1-607) OCA n-74 ALC 27 -ALC 47 -OCA N-533 90 443 1. What is the value of the EOR? a. (27 x 907 (47 x 443) b. (47 x 909 (27 x 443) c. (27 x 443) (47 x 90) 2. What can we conclude about the relationship between the two variables? a. Alcohol consumption is a risk factor for oral cancer. b. Oral cancer is a risk factor for alcohol consumption c. Alcohol consumption is protective against oral cancer. d. There is no relationship between alcohol consumption and oral cancer. 3. If the value of the odds ratio were 5.0, how would it be interpreted? a. The odds of having oral cancer among those who consume alcohol are times the odds of having oral cancer among those who do not consume alcohol. b. The odds of consuming alcohol among those with oral cancer are 5 times the odds of consuming alcohol among those without oral cancer. c. The odds of developing oral cancer are 5 times higher among those who consume alcohol than those who do not consume alcohol. 4. The investigators identified "age" as a potential confounder in the relationship between alcohol use and oral CA. Does "age" meet the apriori criteria? a. Yes b. No c. Maybe so

level (Table 2) Stigators then decided to control for age. So, they stratified the crude data in Table by ago 50-59 years Table 2 (1 607) 40-49 years 1-360 126 OCA -OCA OCA-OCA ALC 4 22 12 37 -ALC 25 309 10 67 60+ years -121 OCA OCA 11 31 12 67 5. What are the stratum-specific odds ratios? 1. 2.2, 2.2, 2.0 b. 0.4.0.4, 0.5 c. 0.6,0.2, 0.2 6. What is the value of the adjusted OR? 7. Is age a confounder, according to the 10% rule? a. Yes b. No 8. Which OR(s) do you report to the media? a. Crude OR b. Stratum-specific OR's c. Adjusted OR 9. Your statement to the media is: "The odds ratio linking alcohol use to oral cancer is 2.1. after adjusting for the influence of age." a. Truc b. False