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Table 5 Sickness absence risk according to source of information, stratified by education level in NUDBa

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

Education level in NUDB Sickness absence risk
A: Self-report B: Register data Difference B-A (95% CI)
Lower secondary or less 0.397 0.663 0.27 (0.23 to 0.30)
Upper secondary, basic 0.368 0.638 0.27 (0.23 to 0.31)
Upper secondary, complete 0.339 0.541 0.20 (0.19 to 0.22)
Tertiary, undergraduate 0.316 0.487 0.17 (0.16 to 0.18)
Tertiary, graduate 0.246 0.343 0.10 (0.09 to 0.11)
  1. CI Confidence interval, NUDB National Education Database
  2. aAnalysis restricted to 28,233 MoBa mothers with register data on both education and sickness absence, and self-report data on sickness absence