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Parathyroid hormone (PTH) levels by Dialysis Outcomes and Practice Patterns Study (DOPPS) phase and selected patient characteristics. Serum calcium and phosphorus categories indicate levels below and above the median. phase 1, 1996–2001; phase 2, 2002–2004; phase 3, 2005–2008; phase 4, 2009–2011; phase 5, 2012 to present.
