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Table 3 SES and major perinatal risk factors

From: Perinatal complications and socio-economic differences in cerebral palsy in Sweden – a national cohort study

   Extremely preterm birth (w 24–32) Asphyxia* Small for gestational age
  All N Incidence (%) N Incidence (%) N Incidence (%)
SES        
Unclassified 212 457 2 350 1.11 5 324 2.51 7 518 3.54
I 189 781 1 991 1.05 4 626 2.44 6 160 3.25
II 109 934 1 108 1.01 2 486 2.26 3 303 3.00
III 101 906 1 048 1.03 2 629 2.58 3 234 3.17
IV 126 174 1 198 0.95 2 887 2.29 3 507 2.78
V 64 602 560 0.87 1 387 2.15 1 705 2.64
Total 804 854 8 255 1.03 19 399 2.40 25 427 3.16
P**    <0.001   <0.001   <0.001
  1. * Low apgar, neonatal distress and/or abruptio placentae
  2. **Chi-square test for linearity exluding the unclassified category