Lab-based and diagnosis-based chronic kidney disease recognition and staging concordance

BMC Nephrology

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
Lab-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%])

ISSN: 1471-2369