Table 1

 Baseline data by return of 12 month respiratory questionnaire

Data obtained 11–15 monthsData obtained outside 11–15 monthsNo datap Value
Data are shown as number (%) or mean (SD).
SDS, Standard deviation score; HFOV, high frequency oscillatory ventilation; PMA, postmenstrual age.
Number4315997
Birth weight (g)909 (205)847 (223)894 (190)0.09
Gestational age (weeks)26.8 (1.4)26.5 (1.4)26.7 (1.2)0.23
Birth weight SDS−0.49 (0.97)−0.73 (0.94)−0.46 (1.00)0.17
Male221 (51%)33 (56%)51 (53%)0.79
Multiple birth96 (22%)12 (20%)23 (24%)0.94
HFOV218 (51%)33 (56%)47 (48%)0.66
Oxygen dependence at 36 weeks PMA247 (57%)35 (59%)45 (46%)0.12
Oxygen dependence at discharge87 (20%)19 (32%)16 (16%)0.06