TABLE 2

Impact of Provider Feedback on Cranial CT Rate by Baseline Quartile of Provider CT Rate (2010–2011) Compared With Postimplementation Period (2012–June 2014)

QuartileMean CT rate Pre-Period, % (95% CI)Mean CT Rate Postperiod, % (95% CI)Mean Difference, % (95% CI)
1 (lowest baseline), (%)4 (2 to 5)2 (1 to 4)2 (1 to 4)
2, (%)6 (5 to 7)6 (2 to 10)0 (–2 to 3)
3, (%)8 (7 to 9)5 (2 to 10)3 (1 to 5)
4 (highest baseline), (%)13 (10 to 16)6 (1 to 14)7 (5 to 9)