Table 4.

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

	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

^aP < 0.05 versus CPAP_HF; ^bP < 0.05 versus CPAP_LF; ^cP < 0.05 versus each mode of CPAP without HH. CPAP, continuous positive airway pressure; CPAP_VENT, ventilator CPAP; CPAP_LF, continuous low-flow CPAP; CPAP_HF, continuous high-flow CPAP; HH, heated humidifier.