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Table 1 Kappa statistics describing constancy of individual cause of death assignments between different data formats presented to the physician coders

From: Effects on the estimated cause-specific mortality fraction of providing physician reviewers with different formats of verbal autopsy data

Cause of death (number of deaths) Kappa statistics (95% confidence interval)
  Structured vs. combined format Unstructured vs. combined format Structured vs. unstructured
Circulatory (487) 0.71 (0.67 - 0.75) 0.70 (0.66 - 0.74) 0.57 (0.52 - 0.61)
Injury (187) 0.81 (0.76 - 0.86) 0.77 (0.72 - 0.82) 0.74 (0.68 - 0.79)
Infectious (134) 0.75 (0.69 - 0.80) 0.70 (0.63 - 0.76) 0.65 (0.58 - 0.72)
Neoplasm (139) 0.83 (0.78 - 0.88) 0.79 (0.73 - 0.84) 0.76 (0.70 - 0.82)
Respiratory (61) 0.57 (0.47 - 0.67) 0.57 (0.47 - 0.68) 0.48 (0.38 - 0.58)
Digestive (43) 0.38 (0.24 - 0.51) 0.52 (0.40 - 0.65) 0.36 (0.23 - 0.50)
Genitourinary (42) 0.53 (0.40 - 0.66) 0.61 (0.48 - 0.74) 0.36 (0.22 - 0.50)
Endocrine (31) 0.53 (0.37 - 0.69) 0.55 (0.40 - 0.70) 0.31 (0.15 - 0.48)
Nervous (23) 0.61 (0.44 - 0.77) 0.63 (0.46 - 0.80) 0.37 (0.19 - 0.55)
Mental (16) 0.62 (0.42 - 0.82) 0.46 (0.22 - 0.70) 0.53 (0.30 - 0.77)
Perinatal (14) 0.83 (0.68 - 0.98) 0.66 (0.44 - 0.88) 0.48 (0.23 - 0.72)
Pregnancy# (4)    
Blood# (3)    
Congenital# (3)    
Skin# (3)    
Unclassified (217) 0.44 (0.38 - 0.50) 0.40 (0.34 - 0.46) 0.31 (0.25 - 0.37)
Overall (1407) 0.66 (0.63 - 0.68) 0.64 (0.61 - 0.67) 0.53 (0.50 - 0.56)
  1. *A kappa statistic of 0.75 or above is generally considered to reflect a high correlation, 0.40 - 0.75 a moderate correlation, and below 0.40 a poor correlation [21]. #No kappa coefficient was calculated because there were too few deaths were recorded to allow informative estimates to be obtained.