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. 2012 Jul 5;7:421–425. doi: 10.2147/COPD.S31378

Table 2.

Characteristics of oxygen (O2) prescription and equipment (n = 97)

Characteristic Result
Proper use of O2 (flow and time) (yes/no [%]) 37/63
Use of water in humidifier (yes/no [%]) 97/3
Backup tank (yes/no [%]) 100/0
Mean length of connector hose (m) 5 ± 3.9