Table 1.

Clinical Characteristics of Study Patients^*

Patients	25
Sex, male/female	15/10
Gestational age at birth, weeks	28 (23 - 41)
Etiology of chronic lung disease, (%)
Bronchopulmonary dysplasia	18 (72%)
Congenital diaphragmatic hernia	3 (12%)
Persistent pulmonary hypertension of the newborn	3 (12%)
Pulmonary hypoplasia	1 (4%)
Age at initiation of sildenafil, days	171 (14 - 673)
Respiratory support at initiation of sildenafil, (%)
Oxygen	25 (100%)
CPAP	1 (4%)
Mechanical ventilation	18 (72%)
ECMO	1 (4%)
Medications at initiation of sildenafil, (%)
Nitric Oxide	18 (72%)
Calcium Channel Blocker†	1 (4%)
Bosentan	2 (8%)
Milrinone	4 (16%)
Diuretics	19 (76%)
Systemic steroids	12 (48%)

CPAP = continuous positive airway pressure; ECMO = extracorporeal membrane oxygenation.

^*Values are median (range) unless otherwise noted.

^†For systemic hypertension.