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EMT-Ps who were originally certified and voluntarily reregistered with the National Registry of Emergency Medical Technicians were more likely to pass an exam similar to their initial certification test when compared with those who did not reregister. They also scored higher on an achievement test related to EMT-P practice. The higher pass rates were observed at both 4 and 6 years following initial registration. The reregistered cohorts were also more likely to have a greater number of self-reported CME. The number of years between certification cycles was significantly higher in the nonreregistered participants. EMT-Ps with more CME, more years in EMS, and higher education were more likely to pass the exam regardless of their reregistration status. While these findings suggest differences between reregistered and nonreregistered EMT-Ps, they are to be considered cautiously in view of the limitations of the study described above. Future work in this area could include a more sophisticated prospective study that would assess the reasons for higher test scores and would perform more detailed analyses of the differences between EMT-Ps who reregister with the National Registry and those who do not.