Brain tumors and electric blanket use. A casecontrol study assessed risks of brain tumors in children. Table

Question:

Brain tumors and electric blanket use. A case–control study assessed risks of brain tumors in children. Table 18.31 cross tabulates the data according to case status and electric blanket exposure.

Calculate the odds ratio and its 95% confidence interval. Comment on the results.

TABLE 18.31 Data for Exercise 18.28.

Cases Noncases EI. blanket + 53 102 EI. blanket − 485 693 Data from Preston-Martin, S., Gurney, J. G., Pogoda, J. M., Holly, E. A., &

Mueller, B. A. (1996). Brain tumor risk in children in relation to use of electric blankets and waterbed heaters. Results from the United States West Coast Childhood Brain Tumor Study. American Journal of Epidemiology, 143(11), 1116–1122. Data are available in the file BRAINTUM.*.

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