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Number of control patients (n = 123) with alerts by each system and number of control patients with at least one alert considered “clinically relevant.” Dark grey: Control patients (n = 123) with an alert. Grey stipple: Control patients (n = 123) with ≥1 “clinically relevant” alert (p = 0.027). MERC, maternal early recognition criteria; MEOWS, modified early obstetric warning score; MEWS, modified early warning system; MEWT, maternal early warning trigger.
