TABLE 1.
Descriptive statistics for infants undergoing physiologic challenge: birth weight, gestational age, post-menstrual age, gender, FiO2, Flow rate for air and O2 delivered by nasal cannula, days receiving mechanical ventilation, and phase angle (ϕ) as a measure for rib cage-abdominal dyssynchrony. The use of 100% O2 via nasal cannula at flow < 1 liter per minute among infants at 36 weeks PMA is a common practice in St. Louis Children’s Hospital NICU
| Birth weight | 837 ± 168 grams (range, 400 to 1160] |
| Gestational age | 26 2/7 ± 12/7 weeks |
| Post-menstrual age | 36 2/7 ± 4/7 weeks |
| Females | 31 (63.3%) |
| FiO2 | 0.7 ± 0.4 |
| Supplemental O2 flow rate | 1.0 ± 1.1 lpm (median 1.0 lpm, range 0.06 to 5.0 lpm |
| Days on Mechanical Ventilation | Median 12.0 days, range 0 to 62 days |
| Phase Angle ϕ | 78.3 ±.42.1, range 12.2 to 157.8 degrees |