Table 1—

Condensate in the breathing system, mean room temperature and absolute humidification

Patient	Pressure cmH₂O	Mean room temperature °C		Water in mask/tube mL		Absolute humidification^# mL
Patient	Pressure cmH₂O	Conventional humidifier	Controlled heated breathing tube humidifier	Conventional humidifier	Controlled heated breathing tube humidifier	Conventional humidifier	Controlled heated breathing tube humidifier
1	7	17.3	11.9	34	0	145	229
2	8	15.6	14.0	34	2	131	136
3	8	14.6	11.6	16	0	130	143
4	12	13.6	14.0	63	2	222	158
5	9	10.8	13.6	29	2	143	92
6	7	15.3	13.6	54	1	76	119
7	7	12.6	12.9	36	5	114	154
8	10	16.2	16.6	26	2	151	149
9	10	14.6	16.0	40	2	145	229
10	7	11.7	11.1	69	2	103	138
11	8	11.0	10.9	27	0	120	137
12	7	15.4	12.2	13	2	178	170
13	7	13.2	14.7	49	2	123	134
14	7	14.1	14.2	22	3	153	85
15	7	13.0	12.0	37	4	113	140
16	7	16.3	15.5	35	1	142	116
17	9	15.1	15.0	7	2	159	203
18	9	13.7	16.1	33	3	125	200
19	7	15.3	15.7	46	2	116	158
Mean±sd	8.1±1.4	14.2±1.8	13.8±1.8	35.3±16.0	1.9±1.3	136.3±30.9	152.1±40.0
p-value		0.52		0.0001		0.12

^#: difference of water in the heating chamber between evening and morning minus water in the mask/tube system. 1 cmH₂O = 0.0978 kPa.