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Table 2 Characteristics of subjects who were and were not recruited for school age follow up in the virus study

From: Participant retention in follow-up studies of prematurely born children

  Followed up (n = 56) Not followed up (n = 103) p value
Sex (M: F) 28: 28 59: 44 0.378*
Maternal ethnicity
 White 23/56 (41%) 32/103 (31%) Overall
 Black 22/56 (39%) 54/103 (52%) 0.278c
 Other 11/56 (20%) 17/103 (17%)  
Index of multiple deprivation (decile) 3 (2–5) 3 (2–5) 0.838b
Birth weight (g) 1836 (707) 1937 (571) 0.036a
Gestational age (weeks) 33.86 (30.71–34.86) 33.71 (31.71–35.29) 0.435b
Multiple birth 22/56 (39%) 25/103 (24%) 0.048*
Surfactant given 13/56 (23%) 20/103 (19%) 0.573*
Maternal smoking in pregnancy 8/56 (14%) 17/103 (17%) 0.713*
Postnatal steroids 2/56 (4%) 1/103 (1%) 0.250*
Oxygen dependency at 28 days 2/56 (4%) 0/103 (0%) 0.054*
Oxygen dependency at hospital discharge 11/56 (20%) 5/103 (5%) 0.003*
  1. Data are shown as n (%), median (interquartile range) or mean (SD)
  2. *indicates p value generated from Chi-squared analysis
  3. afrom unpaired t test
  4. bfrom Mann Whitney u test
  5. cfrom Friedman’s test