Table 1 Loss to follow-up and missing data at two years of corrected age in a very preterm cohort

N = 1737

N = 796 (45.8%)

N = 941 (54.2%)

Missing data

Perinatal and SES variablea^b,c

251 (14.5%)

141 (17.7%)

110 (11.7%)

Neurodevelopmental impairment at 2 years CA^b,d

N/A

N/A

104 (11.1%)

N = 603

N = 196 (32.5%)

N = 407 (67.5%)

Missing data

Perinatal and SES variables^a,d

72 (11.9%)

37 (18.9%)

35 (8.6%)

Neurodevelopmental impairment at 2 years CA^b,d

N/A

N/A

19 (4.7%)

N = 1134

N = 600 (52.9%)

N = 534 (47.1%)

Missing data

Perinatal and SES variables^a,d

179 (15.8%)

104 (17.3%)

75 (14.0%)

Neurodevelopmental impairment at 2 years CA^b,d

N/A

N/A

85 15.9%)