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The frequency (number of events/day) and exposure (number of minutes/day) of intermittent hypoxemia less than 90% events by chronological age, postmenstrual age, and gestational age. See Figure 1 for further details of each row. Similar to IH <80%, yellow is less prominent at the bottom of the heat map signifying that less premature infants have more IH <90% than more premature infants.
