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Basic dichotomous measures
• Relative risk or risk ratio • Oddsratio
• Absoluteriskdifference • Number needed to treat
Risk
• 24 people skiing down a slope, and 6 fall • riskofafall
= 6 falls/24 who could have fallen = 6/24 = 1⁄4 = 0.25 = 25%
risk = number of events of interest total number of observations
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PRECONGRESS COURSE 13 I BARCELONA, SPAIN – 1 JULY 2018 37
