1.   Kelsey spent five weeks on a ventilator and still needed extra oxygen until last week.

2.   She still needs oxygen for her underdeveloped lungs and needs several different drugs every day.

3.   Almost all needed supplemental oxygen.

4.   By that time, she needed oxygen and had begun using a wheelchair.

5.   Cancer tumors need oxygen too, so they snap up porphyrins.

6.   Even if the baby does not look blue, more oxygen may be needed, Dr. Brugman said.

7.   He needs around-the-clock oxygen.

8.   Her son was hospitalized all summer, needing oxygen at home for weeks.

9.   He will need more oxygen than a space-shuttle mission.

10.   If the lungs give out and I need portable oxygen, one side benefit will inure.