TABLE 3

Association of Electronic CDS With Safety 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)
Appendiceal perforation27.625.2−20 (53 to 37)2.5 (−5.2 to 10.9)−0.02 (−1.9 to 1.9)−2.5 (−10.1 to 5.8)
Return ED visits 30 d7.05.1−49 (−76 to 5)0.1 (−8.9 to 10)2.8 (−0.1 to 5.7)2.7 (−6.9 to 13.3)
ED Length of stay, h4.24.22.3 (−4.7 to 9.8)−0.7 (−1.6 to 0.3)0.1 (−0.2 to 0.3)0.8 (−0.3 to 1.8)
  • Negative numbers represent a decline in use, and positive numbers represent an increase in use. All comparisons were not statistically significant.