2.13 For the Women's Health Study, heart attacks were reported for 198 of 19,934 taking aspirin and for 193 of 19,942 taking placebo (J. Am. Med. Assoc. 295: 306-313, 2006). Construct the 2 x 2 table that cross-classifies the treatment with whether a heart attack was reported. Estimate the odds ratio. Interpret. (As of 2006, results suggested that, for women, aspirin was helpful for reducing risk of stroke but not necessarily risk of heart attack.)