By Bill Peckham
RenalWEB links to a National Institutes of Health press release announcing that they are providing more current incidence (transitioning into) and prevalence (already has) data about people treating stage 5 chronic kidney disease (CKD5):
Previously, incidence and prevalence data had been made available only through yearly updates of the USRDS Annual Data Report (www.usrds.org/adr.htm). Because the report includes detailed data from multiple sources, reporting lagged by about 18 months while data were merged and verified. For example, the 2009 report, which became available this month, has complete data only through 2007.
Now we can see the preliminary data for 2008, broken down by quarters.
I was interested to see this graph showing incidence by quarter. Two things struck me. First, the per year/ incident numbers have been flat over the last three years - 2006/111,008; 2007/111,000; 2008/110,766, which is very good news. Second, there appears to be a clear and consistent seasonality to people transitioning to needing either dialysis or transplant.
The seasonality of CKD is consistent - about 10% more people transitioning into CKD5 in the winter vs the summer - Quarter 1 vs. Quarter 3. I can't think of an obvious explanation for this and searching Google came up empty on the specific question of CKD. There are papers noting the seasonality of other diseases (e.g. myocardial infarction) and of mortality generally but it isn't clear why there is a seasonality to developing severe kidney disease.