Statistics: Confidence Intervals – #16


Question:

a) In a study of sudden infant death syndrome [SIDS], the authors report that "7 of the 53 infants who had broncheo-pulmonary displasia [BPD] (13%) and two of the 65 control infants were victims of SIDS (p=.0392)", using the standard (uncorrected) chi-square test. Confirm this result.

b) Give a 2-tailed Fisher’s exact p-value for the above comparison. What is your conclusion using this test statistic?

c) What is the RR of SIDS for an infant with BPD relative to a control infant? Give a 95% confidence interval for this RR. Verbally interpret this result.

d) What is the OR of SIDS for an infant with BPD relative to a control infant? Give a 95% confidence interval for this OR. Verbally interpret this result.

e) Compare the RR and OR derived in 3 & 4 above. Comment on this comparison.

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