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“Pre-NOVA” refers to patients enrolled in the ICU-RESUS parent study prior to prospective collection of ETCO2 waveform data for CPR-NOVA study (October 1, 2016 through May 5, 2019). “Intra-NOVA” refers to patients enrolled after the start of the CPR-NOVA ancillary investigation (May 6, 2019 through March 31, 2021).
