In this context, the unavailability of the glomerular filtration rate to assess CKD stage, as well as no clinical information on PTH levels to identify SHPT should be considered when interpreting the results, as the current analysis relied on the respective ICD-10-GM coding for CKD stages and SHPT, but also for other comorbidities such as renal osteodystrophy. This evidence concerns the gene PTH and chronic kidney disease.