Distribution of facility mean treatment time, by DOPPS region and phase. Distribution of facility mean treatment time, by DOPPS region and phase. Restricted to patients not on catheters with vintage >90 days in facilities with ≥8 baseline patients with treatment time data in DOPPS 1 (1996–2001), DOPPS 2 (2002–2004), DOPPS 3 (2005–2008), and DOPPS 4 (2009–2011). DOPPS, Dialysis Outcomes and Practice Patterns Study; ANZ, Australia and New Zealand. Bruce M. Robinson et al. CJASN 2012;7:1897-1905 ©2012 by American Society of Nephrology