Skip to main content

Table 1 Characteristics of subjects who were and were not recruited for 11–14 year old follow up in the United Kingdom Oscillation Study

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

  Followed up (n = 319) Not followed up (n = 204) p value
Sex (M: F) 162/319 (51%) 109/204 (53%) 0.55*
Maternal ethnicity
 White 285/318 (90%) 149/203 (73%) Overall
 Black 21/318 (6.6%) 35/203 (17%) < 0.001*
 Other 12/318 (3.8%) 19/203 (9.3%)  
Index of multiple deprivation (IMD) 15.2 (1.0 to 68.1) 28.2 (1.1 to 70.0) < 0.001b
Birth weight (g) 895 (209) 914 (204) 0.31a
Birth weight (z score) −0.59 (−3.45 to 2.41) −0.41 (−3.28 to 2.17) 0.050b
Gestational age (weeks) 26.9 (1.33) 26.7 (1.39) 0.35a
Multiple birth 76/319 (24%) 45/204 (22%) 0.64*
Surfactant given 310/319 (97%) 203/204 (99%) 0.097*
Maternal smoking in pregnancy 69/292 (24%) 72/188 (38%) 0.001*
Postnatal steroids 84/314 (27%) 61/203 (30%) 0.42*
Oxygen dependency at 28 days 262/319 (82%) 164/204 (80%) 0.62*
Oxygen dependency at hospital discharge 71/315 (23%) 44/204 (22%) 0.80*
  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