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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