Background
We aimed to update the prevalence of chronic kidney disease (CKD) in Japan. We also explored whether CKD was properly recognized and managed.
Methods
We used data of annual health checkup in 2017, compiling records of five million persons. This had laboratory results, and was linked to healthcare utilization record via personal identifier. CKD was defined as estimated glomerular filtration rate <60 mL/minute/1.73m2 at the checkup. This prevalence was compared with that in 2005 reported previously. Healthcare utilization, such as laboratory tests, disease coding and medication for comorbid diabetes (DM) and hypertension (HT), was used as an indicator for the recognition and management of CKD.
Results
Of the 761,565 records (median age: 46 years [interquartile range: 50-62 years]), CKD was found in 50,091 persons; the crude and age-adjusted prevalence was 63.1 and 71.8 per 1000 persons, respectively. The CKD prevalence was significantly higher in 2017 than in 2005, with a difference of 14.1 per 1000 persons. Among persons with CKD, >95% sought medical service and 64.6% received laboratory tests within 180 days of checkup. However, the diagnostic code suggestive of CKD was recorded in 23.2%, and prescriptions for DM and HT were found in 31.2% (1590/5096) and 36.7% (8081/22,019) of comorbid persons, respectively.
Conclusions
The prevalence of CKD in Japan may have increased over the past decade. However, the recognition of CKD was likely suboptimal, and there is room to improve the management of comorbid DM and HT.