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Table 3 Risk of Hypoxemia at Potential Low SpO2 Alarm Limits

From: Thresholds for oximetry alarms and target range in the NICU: an observational assessment based on likely oxygen tension and maturity

  89% SpO2 88% SpO2 87% SpO2 86% SpO2 85% SpO2 p
n 279 251 331 389 444  
Risk < 50 (%) 46% (40–50%) 49% (40–55%) 50% (45–56%) 74% (70–78%) 71% (66–75%) < 0.001
Risk < 41 (%) 13% (9–17%) 10% (06–14%) 11% (8–15%) 20% (16–24%) 25% (21–29%) < 0.001
PaO2 (mmHg) 51 (44–57) 50 (44–54) 49 (44–55) 46 (42–50) 46 (40–50) < 0.001
  1. Severe hypoxemia defined as PaO2 of < 41 mmHg. Risks shown as a percentage (95% CI of proportion), differences evaluated with chi-square test. PaO2 among all levels presented as median (IQR), with differences in evaluated with Kruskal-Wallis test