Table 3 Temperature and humidity of the medical gas with and without the heated humidifier in patients with acute respiratory failure

CPAP_VENT with HH

32.4 ± 1.4^a,c

34.1 ± 2.8^a,b,c

98.1 ± 1.8^a,c

CPAP_VENT without HH

29.5 ± 2.0^a

18.4 ± 5.5^a,b

61.4 ± 14.7^a,b

CPAP_LF with HH

32.3 ± 1.0^a,c

33.9 ± 1.9^a,c

98.0 ± 1.0^a,c

CPAP_LF without HH

28.5 ± 1.7^a

11.4 ± 4.8^a

40.4 ± 15.5^c

CPAP_HF with HH

29.4 ± 1.1^c

24.2 ± 5.4^c

82.3 ± 18.3^c

CPAP_HF without HH

27.4 ± 1.2

6.4 ± 1.8

24.6 ± 6.9