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Table 1 Characteristics of the study population by occupational level

From: To what extent does IQ 'explain' socio-economic variations in function?

   Occupational level:
  Total High Intermediate Low
  (n = 1211) (n = 385) (n = 422) (n = 404)
Women (%) 48.6 34.5 57.3 41.8 *
Age, mean (SD) 50.3 (15.4) 50.2 (14.7) 48.5 (15.3) 50.1 (15.1)
Low intellectual abilities (%) 31.6 10.4 27.7 48.8 *
Early socioeconomic conditions     
   Deprivation (%) 7.0 4.8 5.7 12.7 *
   Low occupational level of father (%) 36.0 26.6 33.4 47.0 *
   Low educational level of father (%) 54.9 44.7 53.7 63.5 *
   Low educational level of mother (%) 65.5 59.0 60.3 73.9 *
Early developmental factors     
   Assisted birth (%) 5.0 5.8 3.9 5.6
   Low birth weight (%) 4.4 3.0 5.2 5.4
   Nuchal cord (%) 2.4 2.3 1.9 3.4
   Delayed milestones (%) 4.6 2.4 6.5 4.3 *
   Severe disease in childhood (%) 7.2 4.9 7.6 9.2
  1. * p < .05.