Worldwide markets are poised to achieve continuing growth as the aging population worldwide needs homecare oxygen treatment. Older people develop COPD and other respiratory conditions where oxygen is able to improve the quality of the life in a dramatic manner. Portable devices have become affordable and support a mobile lifestyle even while on oxygen. Stationary oxygen concentrators are needed for night use by patients on portable oxygen concentrators during the day. People on oxygen wish to continue usual activities, the portable devices are useful for that during the day. Distributors are concentrated on determining which stationary oxygen concentrator supports patient lifestyle.