Table 3.
Analytic cohort 2 concordance in chronic kidney disease staging between lab data and diagnoses from claims (n = 18,749)
| Lab-based Stages ↓ | ICD-9-based Stages | ||||
|---|---|---|---|---|---|
| Stage 1 | Stage 2 | Stage 3 | Stage 4 | Stage 5 | |
| Stage 1 confirmed, eGFR> = 90 and UACR> = 30 | 8 | 7 a | 5 a | 0 a | 0 a |
| Stage 2 | 177 b | 673 | 1017 a | 39 a | 5 a |
| Stage 3 | 232 b | 994 b | 9730 | 791 a | 38 a |
| Stage 4 | 34 b | 69 b | 1785 b | 2475 | 89 a |
| Stage 5 | 5 b | 5 b | 51 b | 286 b | 234 |
Unbolded cells indicate lab-based CKD stage = ICD-9-based CKD stage (concordance, n = 13,120 [70.0%]); bolded cells with a indicate lab-based CKD stage < ICD-9-based CKD stage (discordance, n = 1991 [10.6%]); bolded cells with b indicate lab-based CKD stage > ICD-9-based CKD stage (discordance, n = 3638 [19.4%])