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. 2019 Jan 5;19:2. doi: 10.1186/s12874-018-0630-7

Fig. 11.

Fig. 11

Power for binary outcomes generated by Eq. (1) with a linear alternative of an odds ratio of 1.01 for a unit increase in BMI. The setup denotes a weak linear alternative in which the log-odds of the event increases linearly but slowly with increasing BMI