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Table 1 Characteristics of participants and non-participants at age 28

From: Changes in quality of life into adulthood after very preterm birth and/or very low birth weight in the Netherlands

   Participants n (%) Non-participants #n (%) p-value
Sex* Male 119 (38) 360 (59) < 0.001
Female 195 (62) 254 (41)
Birth weight (grams) <=1000 46 (15) 93 (15) < 0.825
1001-1250 89 (28) 169 (26)
1251-1500 111 (35) 258 (40)
>1500 68 (22) 123 (19)
Origin* Dutch 293 (94) 500 (82) <0.001
Non-Dutch 18 (6) 110 (18)
Educational level (parents)* Low 81 (26) 254 (46) <0.001
Middle 120 (38) 197 (36)
High 113 (36) 103 (18)
SES (parents)* Low 97 (31) 292 (48) <0.001
Middle 101 (32) 181 (30)
High 114 (37) 135 (22)
Appropriate for gestational age Yes 189 (60) 390 (64) 0.351
No, small 124 (40) 224 (36)
Maternal age at time of birth (years) <20 11 (4) 54 (8) 0.065
>=20 and 289 (92) 566 (88)
<36 14 (4) 23 (4)
>=36   
Disability at age 5* None 89 (29) 119 (20) <0.001
Mild 215 (69) 427 (71)
Severe 8 (2) 53 (9)
Disability at age 10 None 142 (51) 205 (50) 0.058
  Mild 119 (43) 149 (37)  
  Severe 18 (6) 52 (13)  
  1. * p < 0.05.
  2. # Survivors of the POPS cohort at age 28 who did not participate in this follow-up study at age 28.