To investigate if there is an association between the age of first exposure to peanuts and the presence of peanut allergy among children, researchers randomly selected a large sample of children and cross-classified them on their first exposure to peanuts and allergy status. Using the SAS output provided below, answer the following questions. Assume all observed and expected cell counts are greater than five.

The FREQ Procedure Table of age by peanutallergy exposure peanutallergy Frequency Percent Row Pet Col Pet Allergy No Allergy Total Exposed after age 2 1.36 23.98 25.34 5.38 94.62 40.00 24.82 Exposed before age 2 2.05 72.61 74.66 2.74 97.26 60.00 75.18 Total 3.41 96.59 100.00 Statistics for Table of exposure by peanutallergy Column 1 Risk Estimates (Asymptotic) 95% (Exact) 95% Risk ASE Confidence Limits Confidence Limits Row 1 0.0538 0.0140 0.0264 0.0813 0.0297 0.0887 Row 2 0.0274 0.0059 0.0159 0.0390 0.0170 0.0416 Total 0.0341 0.0057 0.0230 0.0452 0.0239 0.0471 Difference 0.0264 0.0152 -0.0033 0.0562 Difference is (Row 1 - Row 2) Column 2 Risk Estimates (Asymptotic) 95% (Exact) 95% Risk ASE Confidence Limits Confidence Limits Row 1 0.9462 0.0140 0.9187 0.9736 0.9113 0.9703 Row 2 0.9726 0.0059 0.9610 0.9841 0.9584 0.9830 Total 0.9659 0.0057 0.9548 0.9770 0.9529 0.9761 Difference -0.0264 0.0152 -0.0562 0.0033 Difference is (Row 1 - Row 2) Estimates of the Relative Risk (Row1/Row2) Type of Study Value 95% Confidence Limits Case-Control (Odds Ratio) 2.0190 1.0112 4.0311 Cohort (Coll Risk) 1.9641 1.0137 3.8057 Cohort (Col2 Risk) 0.9728 0.9428 1.0038

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