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Analysis also requires evaluating the quality of each study, including design, potential biases, and the likelihood of chance effects by statistical analysis (e.g., p values as discussed in chapter 10).Ultimately, however, considerations include what percentage of evidence supports versus refutes the hypothesis (as described in chapter 1, a percentage is a form of a fraction)
Emergency contraception pills do not work as well as other regular types of birth control
[77] After a protest caused by cigarette shortages in 1990, transnational tobacco companies began to invest in the Russian tobacco market, particularly in production
Featherstone and Siegel, 2015)
[13] Wu Yiqun, vice executive director with the Beijing-based Thinktank Research Center for Health Development, criticized China's tobacco industry supervisory administration for "[failing] to oversee Chinese tobacco producers" in this aspect
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