Figure 2.

Lookback window, index observation, and prediction horizon. Top: Starting with the 5th blood glucose (BG) measurement, our machine learning algorithm begins to make predictions about a patient's next BG measurement in an expected prediction horizon of five minutes-ten hours. Data preceding the 5th BG measurement are included in summary statistics over the previous 24 h and admission as applicable.

Bottom: As a patient's admission becomes longer, BG measurements that were earlier in the admission may no longer be included in the 24 h summary statistics but will continue to be included in the admission summary statistics. The five minute to ten hour prediction horizon continues to roll with each new BG measurement.