TABLE 1.

Participant Characteristics (N = 43)

	Mean ± SD	Median	Min	Max
Birth weight	1302 ± 405	—	590	2345
Gestational age at birth	29.7 ± 2.0	—	25.1	32.7
Postnatal age on first testing day (d)	16.5	—	3	50
APGAR (5-min)	8.5 ± 1.0	—	6	10
Illness severity day 1 (SNAP-II)*	11.1 ± 9.2	—	0	34
Intravenous morphine exposure (mg/kg)	0.08	—	0	0.63
Days on ventilator†	—	5.5 ± 9	0	38
Other respiratory support†	—	8.8 ± 8.8	0	32
Invasive procedures since birth†	—	61 ± 42	7	157

^*Score for Neonatal Acute Physiology.

^†From birth to first testing day.