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. Author manuscript; available in PMC: 2013 Mar 2.
Published in final edited form as: Pediatrics. 2008 Oct;122(4):775–781. doi: 10.1542/peds.2007-2252

TABLE 2. Outcomes According to Cortisol Quartiles at Baseline (12–48 Hours).

N Lower
Quartile
Middle
Quartiles
Upper
Quartile
P Odds Ratio (95% Confidence Interval)
Lower Quartile
vs Middle
Quartiles
Upper Quartile
vs Middle
Quartiles
Outcomes
 Death before postmenstrual age of 36
  wk, n/N (%)
332 8/83 (10) 21/166 (13) 19/83 (23) .15 1.18 (0.46–3.02) 2.08 (0.99–4.37)
 BPD, n/N (%) 281 43/74 (58) 83/144 (58) 39/63 (62) .65 0.94 (0.50–1.77) 1.31 (0.69–2.49)
 Any IVH, n/N (%) 320 20/82 (24) 58/159 (36) 39/79 (49) .06 0.78 (0.41–1.48) 1.73 (0.98–3.06)
 Severe IVH, n/N (%) 320 9/82 (11) 19/159 (12) 26/79 (33) .001 1.80 (0.71–4.60) 3.96 (1.91–8.21)
 PVL, n/N (%) 214 1/60 (2) 8/110 (7) 5/44 (11) .12 0.18 (0.02–1.55) 1.92 (0.55–6.65)
 Any gastrointestinal perforation, n/N (%) 332 2/83 (2) 15/166 (9) 12/83 (14) .09 0.33 (0.07–1.55) 1.78 (0.76–4.17)
 Spontaneous gastrointestinal
  perforation, n/N (%)
332 2/83 (2) 7/166 (4) 10/83 (12) .11 0.93 (0.17–4.98) 2.84 (0.99–8.15)
 Nosocomial infection, n/N (%) 332 35/83 (42) 68/166 (41) 38/83 (46) .84 1.15 (0.65–2.04) 1.14 (0.66–1.96)
 Severe ROP, n/N (%) 282 14/74 (19) 47/145 (32) 21/63 (33) .53 0.69 (0.32–1.46) 1.09 (0.55–2.16)
Treatments
 Open-label hydrocortisone use during
  treatment, n/N (%)
332 15/83 (18) 49/166 (30) 16/83 (19) .17 0.68 (0.34–1.37) 0.55 (0.28–1.07)
 Vasopressor use during first 28 d, n/N
  (%)
332 39/83 (47) 127/166 (77) 55/83 (66) .004 0.37 (0.20–0.69) 0.51 (0.28–0.96)
 Duration of vasopressor use, median
  (interquartile range), d
332 0 (0–4) 4 (1–7) 2 (0–6) .21 NA NA

N indicates the number of observations. P values refer to differences between all groups. The denominator for IVH is based on the number of infants with head ultrasound scans before death, the denominator for periventricular leukomalacia is based on the number of infants with head sonograms at 4 to 6 weeks of age, the denominator for BPD is based on survivors at postmenstrual age of 36 weeks, and the denominator for severe (stage 3 and above) retinopathy of prematurity is based on the number of infants diagnosed before death. Severe IVH includes grades 3 and 4. Any gastrointestinal perforation includes all causes. Spontaneous gastrointestinal perforation is not associated with necrotizing enterocolitis. PVL indicates periventricular leukomalacia; ROP, retinopathy of prematurity; NA, not applicable.