. Author manuscript; available in PMC: 2020 Mar 1.

Published in final edited form as: Respir Med. 2019 Feb 13;149:52–58. doi: 10.1016/j.rmed.2019.02.004

Table 1.

Definitions for duration of follow-up and level of oxygen adherence.

	Definition
Duration of Follow-up
Over all follow-up	Oxygen equipment delivery day through end of follow-up
Short-term	Oxygen equipment delivery day through day 30
Medium-term	Days 270 through day 365 (months 9 through 12)
Long-term	Days 366 through end of follow-up (months 13 to end)
Oxygen Adherence
Participants prescribed continuous oxygen (24-hour)
Low	< 16 hours/day on average
High	≥ 16 hours/day on average
Participants prescribed intermittent oxygen (during exercise and sleep)
Low	< 8 hours/day on average
High	≥ 8 hours/day on average