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Table 2 Comparison of reported birth outcomes vs. linked birth outcomes

From: Comparison of reproductive history gathered by interview and by vital records linkage after 40 years of follow-up: Bogalusa Babies

  agreement (κ)a mean differencea CI median difference
birthweight   −2.4 −17.8, 13.0 −0.1 g
low birthweight 0.95    
very low birthweight 0.98    
3-level low birthweight 0.94    
macrosomia 0.99    
gestational age   0.01 −0.09, 0.10 −0.50
preterm birth 0.81    
very preterm birth 0.87    
3-level preterm birth 0.79    
postterm 0.89    
  1. acontrolling for clustering within woman; medical records value – self-report