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Populaiton Level Predition: the time-at-risk window in Population setting?

dear all,
when I use the atlas to do the PLP research, I found there is also a the time-at-risk window in the population setting, I am wondering when I set the window like the picture, if the outcome occurred on the same day with the target cohort start will be included in the outcome, and to train or test the analysis model?

t