Using the data below calculate the risk difference, the risk ratio and the odds ratio Discuss the overall results (Table 1) and the results of the cohort stratified by smoking Discuss the estimates of risk difference, risk ratios, and odds ratios Interpret and discuss the meaning of the stratified results Gastric Cancer Yes No Smoke Yes 150 150 30 No 50 700 75 RD RR OR You stratify by Smoking with the below numbers Gastric Cancer Yes No Salt Yes 100 100 50 No 30 350 56 Population 1 Smoke RD RR OR Population 2 No Smoke Gastric Cancer Yes No Salt Yes 50 50 38 No 20 350 70 RD RR OR

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Question: Using the data below calculate the risk difference, the risk ratio and the odds ratio. Discuss the overall results (Table 1) and the results of

Using the data below calculate the risk difference, the risk ratio and the odds ratio. Discuss the overall results (Table 1) and the results of the cohort stratified by smoking. Discuss the estimates of risk difference, risk ratios, and odds ratios. Interpret and discuss the meaning of the stratified results.

		Gastric Cancer
		Yes	No
Smoke	Yes	150	150	30
Smoke	No	50	700	75

RD =

RR = OR=

You stratify by Smoking with the below numbers:

		Gastric Cancer
		Yes	No
Salt	Yes	100	100	50
Salt	No	30	350	56

Population 1 - Smoke

RD =

RR = OR=

Population 2 No Smoke

		Gastric Cancer
		Yes	No
Salt	Yes	50	50	38
Salt	No	20	350	70

RD =

RR = OR=

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