TABLE 1

Participant Characteristics

ELBW, n = 100NBW, n = 89
nMeanSDnMeanSDP
Cohort demographics
 Birth weight, g100834.90132.74893388.12465.63
 Average for gestational age
  n (%)71(71.00)
 Small for gestational age
  n (%)29(29.00)
 Age, y10032.081.698932.471.37.084
 Sex male, %1003939893337.00.074
 Childhood (parental) SES, n (%)9589.620
  I5(5.26)7(7.87)
  II16(16.84)20(22.47)
  III44(46.32)32(35.96)
  IV27(28.42)26(29.21)
  V3(3.16)4(4.49)
 NSI, n (%)10026(13.76)891(1.12)<.001
 Married, n (%)10045(45.00)8953(59.55).046
 Have children, n (%)10020(20.00)8929(32.58).049
Adult SES variables, age 29–36
 Total years of education9716.002.758816.673.12.126
 Personal annual income, $8826 484.6523 721.368146 551.6231 263.84<.001
 Total household annual income, $9154 450.5541 004.418178 148.1541 985.45<.001
 Full-time employment this year, n (%)7848(61.54)7759(76.62).042
Cognitive variables, age 8
 WISC-R full scale IQ8993.4015.7789106.2011.73<.001
 WISC-R verbal IQ8993.4715.0089103.6012.35<.001
 WISC-R performance IQ8994.8716.9489108.1012.45<.001
 Woodcock–Johnson standard score8991.6015.988999.7813.86<.001
 WRAT-R arithmetic standard score8983.3616.168995.2813.64<.001
  • —, gestational age information pertains only to ELBW participants.