Table 2.

Pre- and Post-clinical Decision Support Crude Pulmonary Embolism Computed Tomography Yield and Interval Change per Emergency Physician

Physician ID	Change in Crude PE-CT Yield Between Pre and Post-CDS Implementation	Pre-CDS Crude PE-CT Yield	No. of Ordered Examinations in the Pre-CDS Period	Post-CDS Crude PE-CT Yield	No. of Ordered Examinations in the Post-CDS Period	Statistical Significance of Adjusted Intra- and Inter-physician Variability (P Value)*
1	–9.09%	9.09%	22	0.00%	21	.22 (NS)
2	–8.70%	8.70%	23	0.00%	14	.37 (NS)
3	–6.63%	10.98%	82	4.35%	46	.08 (NS)
4	–3.60%	11.76%	51	8.16%	49	.70 (NS)
5	–1.62%	6.38%	47	4.76%	42	.99 (NS)
6	–1.56%	13.16%	76	11.59%	69	.53 (NS)
7	–0.30%	12.50%	64	12.20%	41	.75 (NS)
8	–0.27%	11.54%	52	11.27%	71	.91 (NS)
9	1.68%	11.19%	134	12.87%	101	.65 (NS)
10	1.83%	9.71%	103	11.54%	104	.95 (NS)
11	2.00%	8.60%	93	10.61%	66	.85 (NS)
12	2.39%	10.11%	89	12.50%	96	.90 (NS)
13	2.73%	10.00%	60	12.73%	55	.70 (NS)
14	3.85%	4.35%	46	8.20%	61	.63 (NS)
15	3.94%	10.34%	29	14.29%	28	.96 (NS)
16	5.52%	12.66%	79	18.18%	44	.60 (NS)
17	5.73%	5.26%	76	10.99%	91	.25 (NS)
18	6.15%	6.35%	63	12.50%	40	.17 (NS)
19	8.35%	8.05%	87	16.39%	61	.16 (NS)
20	9.63%	5.88%	17	15.52%	58	.33 (NS)
21	11.31%	4.76%	84	16.07%	56	.27 (NS)
22	12.38%	5.26%	38	17.65%	34	.15 (NS)
23	13.31%	4.08%	49	17.39%	46	.04
24	17.58%	20.51%	39	38.10%	21	.02
25	20.97%	2.56%	39	23.53%	34	.04
All physicians	3.39%	9.21%	1542	12.60%	1349	<.01

CDS = clinical decision support; ID = identification; NS = not significant; PE-CT = pulmonary embolism computed tomography.

The P value of the adjusted intra-physician variability measures the likelihood that differences between pre- and post-CDS yield could have occurred by chance after controlling for patient specific variables. Crude and adjusted inter-physician variability is shown in the last row for all physicians.

^*Accounting for patient characteristics.