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Table 4 Discrepancy between register data and self-report data on education level and sickness absence

From: Information bias of social gradients in sickness absence: a comparison of self-report data in the Norwegian Mother and Child Cohort Study (MoBa) and data in national registries

  Sickness absence
Maternal absence, no register absence Maternal and register data agreement No maternal absence, register absence Total
Education level
 Maternal level higher than register level N = 188 N = 3397 N = 1139  
O = 0.0070 O = 0.1256 O = 0.0421 N = 4724
E = 0.0072 E = 0.1310 E = 0.0365 O = 0.1747
 Maternal and register data agreement N = 869 N = 15,799 N = 4156  
O = 0.0321 O = 0.5842 O = 0.1537 N = 20,824
E = 0.0318 E = 0.5773 E = 0.1610 O = 0.7701
 Maternal level lower than register level N = 59 N = 1075 N = 360  
O = 0.0022 O = 0.0398 O = 0.0133 N = 1494
E = 0.0023 E = 0.0413 E = 0.0115 O = 0.0552
 Total N = 1116 N = 20,271 N = 5655 N = 27,042
O = 0.0413 O = 0.7496 O = 0.2091 O = 1.000
  1. N Number in category, O Observed fraction, E Expected fraction assuming independence. (E.g., expected frequency for mothers higher on education and lower on sickness absence = 0.1747 × 0.2091 = 0.0365)