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Table 2 Neonatal characteristics of infants and their relation with ROP development

From: Incidence and risk factors of retinopathy of prematurity in three neonatal intensive care units in Palestine

Variable Category No ROP % (n = 88) ROP % (n = 27) P value
Gestational age (weeks) Mean ± SD 30.7 ± 1.4 29.4 ± 1.3 < 0.0010*
Gestational age group ≤ 30 weeks 29 (55.8%) 23 (44.2%) < 0.0010*
  >  30 59 (93.7%) 4 (6.3%)  
Birth weight (grams) Mean ± SD 1382.5 ± 253.3 1185.0 ± 308.3 0.0012*
Birth weight group <  1000 g 4 (44.5%) 5 (55.5%) 0.0085*
  1000–1500 g 53 (74.6%) 18 (25.4%)  
  >  1500 g 31 (91.2%) 3 (8.8%)  
Type of pregnancy Singleton 14 (73.7%) 5 (26.3%) 0.75
  Multiple gestation 74 (77.1%) 22 (22.9%)  
Multiple gestation Twin 23 (82.1%) 5 (17.9%) < 0.0010*
  Triplet 30 (85.7%) 5 (14.3%)  
  Quadruplet 21 (75%) 7 (25%)  
  Quintuplet 0 5 (100%)  
Sibling Sibling affected by ROP 10 (37%) 17 (63%) < 0.0010*
  Sibling not affected by ROP 61 (97%) 2 (3%)  
Level of HB at birth (g/dl) Mean ± SD 15.7 ± 1.8 14.9 ± 2.6 0.043*
  1. % within the same variable group
  2. *significant at p value less than 0.05
  3. ROP Retinopathy of Prematurity
  4. SD Standard Deviation
  5. HB hemoglobin