We conclude that there is statistically significant evidence for an association

# We conclude that there is statistically significant

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We conclude that there is statistically significant evidence for an association between weight for age in children under 5 year and rate of diarrhea, assuming no confounding, selection bias or information bias. c. Calculate the rate ratio and 95% confidence interval for the association between malnutrition and diarrhea. Interpret the numeric results succinctly. IRR = 1.24 Let X = ln ( ^ IRR ) = 0.215 ^ Var ( X ) = ^ Var ( ln ( ^ IRR ) ) = 1 a + 1 b = 0.00649 + 0.00348 = 0.00997 95% CI for ln(IRR) X ± 1.96 ^ Var ( X )= 0.215 ± 0.1957 =( 0.0193,0.4107 ) 95% CI for IRR: e X ± 1.96 ^ Var ( X ) =( 1.02,1.51 ) These data are consistent with IRR ranging from 1.02 to 1.51 with 95 % confidence, assuming no confounding, no selection bias, no information bias. d. Calculate the rate difference and 95% confidence interval for the association between malnutrition and diarrhea. Interpret the numeric results succinctly. X = ^ IRD = a N 1 b N 0 = 0.77 ^ Var ( IRD ) = a N 1 2 + b N 0 2 = 0.1038 + 0.0364 = 0.1402 95% Confidence Interval: X ± 1.96 ^ Var ( X )= 0.77 ± 0.734 =( 0.036,1.50 ) These data are consistent with IRD ranging from 0.036 to 1.50 per PY with 95% confidence, assuming no confounding, no selection bias, no information bias. 2. A cigarette smoking history was obtained from 6,990 Japanese- American men examined from 1965 through 1968. Over 22-years of follow-up, 37 incident cases of oral or bladder cancer were observed among the 2,344 never smokers, and 165 incident cases or oral or bladder cancer were observed among the 4,346 past and current smokers (Chyou PH, Nomura AMY, Stemmermann GN. Am J Public Health 1992; 83: 37-40).  #### You've reached the end of your free preview.

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• Summer '14
• FrancisCook
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