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Table 4 Temperature and humidity of the medical gas with and without the heated humidifier in healthy individuals

From: Effect of a heated humidifier during continuous positive airway pressure delivered by a helmet

  Temperature (°C) Absolute humidity (mgH2O/l) Relative humidity (%)
CPAPVENT with HH 31.7 ± 1.0a,c 32.8 ± 1.7a,c 98.1 ± 1.4a,c
CPAPVENT without HH 27.6 ± 1.3a,b 12.1 ± 3.4a,b 45.1 ± 10.9a,b
CPAPLF with HH 31.4 ± 0.5a,c 32.0 ± 0.8a,c 97.2 ± 1.6a,c
CPAPLF without HH 26.4 ± 1.3 7.4 ± 2.2 30.0 ± 8.4
CPAPHF with HH 28.5 ± 0.8c 24.6 ± 2.1c 88.3 ± 4.8c
CPAPHF without HH 25.9 ± 1.1 7.1 ± 1.1 29.8 ± 4.8
  1. aP < 0.05 versus CPAPHF; bP < 0.05 versus CPAPLF; cP < 0.05 versus each mode of CPAP without HH. CPAP, continuous positive airway pressure; CPAPVENT, ventilator CPAP; CPAPLF, continuous low-flow CPAP; CPAPHF, continuous high-flow CPAP; HH, heated humidifier.