RT Journal A1 Profit J, Woodard LD T1 PErils and opportunities of comparative performance measurement JF Archives of Pediatrics & Adolescent Medicine JO Archives of Pediatrics & Adolescent Medicine YR 2012 FD February 1 VO 166 IS 2 SP 191 OP 194 DO 10.1001/archpediatrics.2011.810 UL http://dx.doi.org/10.1001/archpediatrics.2011.810 AB These findings raise several important questions. First, what are the reasons for the large variation in NDI? Second, why are follow-up rates in the United States lower than those in other high-income countries? Third, what are the implications for comparative performance measurement?