Data collection procedure:
To collect the data, we obtained a list of patients who entered the
SSCKD during the 2016-2018 period. The SSCKD was created from patients
referred from primary care centers attached to the hospital. In the
healthcare centers, the physician performed the CKD screening estimating
the GFR using the modification dialysis renal disease 4 (MDRD4) formula
and the albumin/creatinine ratio in urine at random. Physicians referred
patients with an estimated GFR <60 mL/min / 1.73m2 for care
with the nephrologist. In the first visit, the nephrologist repeated
creatinine and other laboratory data were requested.
Subsequently, we reviewed the laboratory results requested by the
nephrologist for the patient’s admission to the database, using the
software called ”RESULAB”. We collected serum creatinine (mg/dl), eGFR
(ml/min/1,73m2), glucose (mg/dl), total protein (g/dL), albumin (g/dL),
glutamic-pyruvic transaminases (U/L), glutamic-oxaloacetic transaminases
(U/L), total bilirubin (mg/dL), alkaline phosphatase(U/L), globulin
(g/dL), hemoglobin (g/dl), platelets (K/uL), neutrophils (K/uL) and
lymphocytes (K/uL). We determined the vital status and date of death
through the consultation of the National Registry of Identification and
Civil Status (RENIEC, in Spanish) portal.
(https://portaladminusuarios.reniec.gob.pe/validacionweb/index.html#no-back-button).
For non-survivors patients, we collected the date of death for any cause
to establish the time until the event. For those patients who did not
die during the established period, the closure of the follow-up was Oct
31, 2019. We marked the beginning of the follow-up by the patient’s
admission to the SSCKD.