Table 1.

Characteristics of the different cohorts used in the analyses, matching criteria, and inclusion criteria

Cohort 1 (Analyzes Age at Start)Cohort 2 (Characteristics)Cohort 3 (Clinical Analyses)
Controls serving to…Study differences in mean age of start of RRTStudy treatment modality at start of RRT and during follow-upStudy clinical parameters in dialysis patients
Number of controls for each NC patient223
CountryMCMCMC
Calendar year start RRTMCMC (2-year intervals)
Age at start RRTMC (2-year intervals)MC (2-year intervals)
GenderMC
Treatment modalityMC
    year of start RRT1979 to 20081995 to 20081995 to 2008
    inclusion criteriaData collection over 18 years
    countries includedAustria, Denmark, Iceland, Italy, Spain, Sweden, Switzerland, the Netherlands, and the United KingdomAustria, Belgium, Denmark, France, Hungary, Iceland, Italy, the Netherlands, Norway, Poland, Portugal, Russia, Serbia, Slovenia, Spain, Sweden, Switzerland, Turkey, and the United KingdomBelgium, Denmark, France Italy, Norway, Poland, Portugal, Serbia, Slovenia Spain, and the United Kingdom
  • MC, matching criterion was used to identify control subjects; NC, nephropathic cystinosis; RRT, renal replacement therapy.