Background characteristics of participants and non-participants in the very preterm/very low birth weight and the control group.

ISCED = International Standard Classification of Education; NSI = neurosensory impairment from childhood defined as having one or more of the following: visual impairment, hearing impairment, cerebral palsy or cognitive disability (determined through an IQ test or other information); SD = standard deviation; VP/VLBW = very preterm (<32 weeks of gestation)/very low birth weight (<1500g); wk = week. ^aESTER Preterm Birth Study cohort not included due to no data available for non-participants. ^bNo data available for the control group in the NZ VLBW cohort. ^cData missing for 77 participants and 30 non-participants in the VP/VLBW group. ^dData missing for 39 participants and 42 non-participants in the VP/VLBW group. ^eData missing for 52 participants and 114 non-participants in the VP/VLBW group, and 98 participants and 223 non-participants in the control group. ^fData missing for 18 participants and 95 non-participants in the VP/VLBW group, and 17 participants and 141 non-participants in the control group.

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