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Table 4 Validity of physician billing chronic dialysis case definitions compared with reference standard registry case definition

From: Validation of a case definition to define chronic dialysis using outpatient administrative data

Definitions Admin (+)
n (prev.)
(a+b)
Registry (+)
Admin (+)
n (a)
Registry (-)
Admin (+)
n (b)
Registry (+)
Admin (-)
n (c)
Registry (-)
Admin (-)
n (d)
Positive
agreement
Sensitivity PPV Kappa
1 outpatient claim 2324 (0.21%) 1805 519 422 1,115,351 0.793 0.811 0.777 0.793
2 outpatient claims 2171 (0.19%) 1751 420 476 1,115,450 0.796 0.786 0.807 0.796
2 outpatient claims at least 90 days apart 1657 (0.15%) 1406 251 821 1,115,619 0.724 0.631 0.848 0.724
Continuous outpatient claims for at least 90 days with no gaps greater than 21 days 1508 (0.13%) 1295 213 932 1,115,657 0.693 0.582 0.859 0.693
  1. Abbreviations: prev - Prevalence = Admin (+)/total N