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

Sex (M: F)

162/319 (51%)

109/204 (53%)

0.55^*

 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)

< 0.001^b

Birth weight (g)

895 (209)

914 (204)

0.31^a

Birth weight (z score)

−0.59 (−3.45 to 2.41)

−0.41 (−3.28 to 2.17)

0.050^b

Gestational age (weeks)

26.9 (1.33)

26.7 (1.39)

0.35^a

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^*