Fig. 6. Zrelscores are stable over time when no interventions occur. Zrelscores are shown for the 47 residents having no performance interventions and who had 15 or more evaluations in both Period 1 (October 1, 2008–March 31, 2009) and 1 yr later in Period 2 (October 1, 2009–March 31, 2010). The fitted line includes all data points (r = 0.75, r 2= 0.56, N = 48, P < 0.001).