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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