TABLE 3

Patient Characteristics

Obstructive, Median [IQR] or % (n/N)Restrictive, Median [IQR] or % (n/N)Mixed, Median [IQR] or % (n/N)P
Demographics
 African American race27% (15/56)50% (5/10)30% (13/44).33
 Female sex37% (21/56)70% (7/10)41% (18/44).16
 Gestational age, wk25.6 [24.6–27.1]24.9 [23.6–26.6]25.1 [24.1–27.1].26
 Birth wt, g748 [622–962]619 [475–675]687 [570–860].04
 SGA18% (10/56)40% (4/10)27% (12/44).18
 Antenatal steroids84% (47/55)70%84% (36/43).48
 ETS during pregnancy30% (16/53)67%34% (15/44).06
 Immediate FH of asthma30% (15/50)12%40% (17/43).28
36-wk status
 On positive pressure100% (51/51)90% (9/10)98% (41/42).49
 Fio20.52 [0.43–0.65]0.53 [0.39–0.71]0.53 [0.41–0.70].91
 RSS, MAP × Fio26.9 [4.3–8.9]8.2 [5.8–9.9]6.5 [4.0–9.3].79
Status at or after iPFT
 PMA, wk53 [45–63]65 [48–77]50 [44–58].21
 Wt, kg4.5 [3.7–5.9]5.7 [4.2–7.0]4.2 [3.5–5.5].23
 Length, cm55 [50–59]57 [51–63]52 [49–58].27
 Noninvasive support38% (21/56)90% (9/10)41% (18/44).008
 Endotracheal tube21% (12/56)0% (0/10)34% (15/44).06
 Tracheostomy41% (23/56)10% (1/10)25% (11/44).07
 Tracheostomy after iPFT7% (4/56)0% (0/10)2% (1/44).62
 Ventilator d after iPFT117 [59–308]20 (n = 1)40 [15–65].001a
NICU outcomes
 NEC7% (4/56)10% (1/10)2% (1/44).27
 Grade 3 or 4 IVH16% (9/56)20% (2/10)5% (2/44).10
 Sepsis32% (18/56)40% (4/10)25% (11/44).55
 PDA ligation32% (18/56)10% (1/10)39% (17/44).22
Discharge outcomes
 Survival91% (51/56)100% (10/10)95% (42/44).61
 LOS, d338 [218–484]312 [222–450]288 [212–414].27
 LOS survivors, d323 [211–483]312 [222–450]288 [215–408].44
 Discharged on ventilator14% (8/56)0% (0/10)2% (1/44).08
 Ventilator days204 [100–431]111 [78–160]149 [102–224].12
 Ventilator days survivors187 [74–410]111 [78–160]146 [98–208].28
  • ETS, environmental tobacco smoke; FH, family history; Fio2, fraction of inspired oxygen; IVH, intraventricular hemorrhage; LOS, length of stay; MAP, mean airway pressure; NEC, necrotizing enterocolitis; PDA, patent ductus arteriosus; RSS, respiratory severity score.

  • a Restrictive n = 1, so it was not included in the statistical analysis.