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Table 1 Birth, medical and demographic characteristics at randomization

From: Early intervention influences positively quality of life as reported by prematurely born children at age nine and their parents; a randomized clinical trial

  PI Group N = 72 PC Group N = 74 TR Group N = 75
Infant characteristics
BW, mean ± SD, g 1396 ± 429 1381 ± 436 3619 ± 490
400 - 1000 g, n (%) 20 (28) 20 (27)  
1001 - 1500 g, n (%) 15 (21) 20 (27)  
1501 - 2000 g, n (%) 37 (51) 34 (46)  
GA, mean ± SD, wk 30.2 ± 3.1 29.9 ± 3.5 39.3 ± 1.3
< 28 wk, n (%) 17 (24) 19 (27)  
28 - 32 wk, n (%) 36 (50) 37 (50)  
≥33 wk, n (%) 19 (26) 18 (24)  
Boy, n (%) 38 (53) 39 (53) 40 (54)
Twin, n (%) 16 (22) 14 (19) 0
SGA 11 (14) 10 (13)  
Prenatal steroid use, n (%) 53 (74) 57 (77)  
SNAP II, mean ± SD 8.3 ± 10.9 10.4 ± 11.3  
CRIB score, mean ± SD, N = 85 3.2 ± 2.8 2.7 ± 2.9  
Received ventilation, n (%) 29 (40) 37 (50)  
Duration of ventilation, n (%) 7.0 ± 18.6 7.1 ± 17.3  
Postnatal steroid use, n (%) 9 (13) 10 (14)  
Oxygen therapy at 36 wk GA, n (%) 11 (15) 14 (19)  
Abnormal cerebral ultrasound, n (%)
IVH grade 1 or 2 7 (10) 8 (11)  
IVH grade 3 or 4 3 (4) 5 (7)  
Periventricular leukomalacia 4 (6) 8 (11)  
Maternal and social characteristics
Mother’s age, mean ± SD, y 30.8 ± 6.1 29.1 ± 6.4 29.7 ± 6.1
Firstborn child, n (%) 40 (56) 37 (54) 27 (37)
Mother’s education, mean ± SD,a) 14.6 ± 2.8 13.5 ± 3.2 14.9 ± 2.8
Father’s education, mean ± SD,a) 13.8 ± 3.1 13.5 ± 3.2 14.4 ± 3.2
Mother’s monthly income,b) 15.8 ± 7.7 14.6 ± 6.7 15.9 ± 8.0
Father’s monthly income,b) 21.1 ± 8.7 19.9 ± 8.1 21.9 ± 9.8
  1. a) = education in years.
  2. b) = in Norwegian 1000 kroner, calculated for 131 families due to 15 twins.
  3. CRIB = Clinical Risk Index for Babies.
  4. IVH = Intraventricular Hemorrhage.
  5. SGA = defined as BW > 2SD below the mean for GA.
  6. SNAP II = Score of Acute Neonatal Physiology II.