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Fig. 2 | BMC Psychiatry

Fig. 2

From: Predictive models for suicidal thoughts and behaviors among Spanish University students: rationale and methods of the UNIVERSAL (University & mental health) project

Fig. 2

Statistical power for different study sample sizes. The UNIVERSAL (University and Mental Health) project. Statistical Power* to detect relative risk of various sizes (relative risk of 2 or 2.5) versus study sample size*Power is obtained assuming significance level alpha of 0.05 (unilateral contrast), a fixed prevalence of exposure to a given risk factor of 20%, and different levels of probability of the event in the non-exposed group (p0=0.01, p0=0.02 or p0=0.03). Acronyms: RR= Relative risk, I= Incidence, p0= probability of the event among the non-exposed.Points highlighted in the graph: RR = 2 and p0 = 0.01 (point A); RR=2 and p0 = 0.03 (point B); RR = 2.5 and p0 = 0.02 (point C); and RR = 2.5 and p0 = 0.03 (point D)

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BMC Psychiatry

ISSN: 1471-244X

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