TABLE 2

Association of Electronic CDS With Primary Outcomes: Interrupted Time-Series

Preimplementation Use Period Average %Implementation Use Period Average %Immediate Impact on Use Percent Change (95% CI)Preimplementation Percent Change per Month (95% CI)Implementation Percent Change per Month (95% CI)Change in Trend per Month From Preimplementation to Implementation (95% CI)
Primary outcomes
 CT use38.823.8−20 (−33.4 to −3.6)1 (−1.4 to 3.5)−2.5 (−3.3 to −1.7)*−3.5 (−5.9 to −0.9)*
 US use45.759.7−5.7 (−22 to 14.9)2.7 (−0.1 to 5.7)1.4 (0.8 to 2.1)*−1.3 (−4.1 to 1.6)
 Total imaging use72.470.2−17.2 (−27.4 to −5.7)1.8 (0 to 3.7)0.5 (0 to 0.9)−1.3 (−3.2 to 0.6)
  • Negative numbers represent a decline in use, and positive numbers represent an increase in use. *P < .05, all other comparisons are not statistically significant.