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Average annual growth rate of imaging per emergency department visit, 1996 to 2012
| 1996–2003 (%) | 2004–2012 (%) | P * | |
|---|---|---|---|
| Total imaging | 4 ± 4 | −2 ± 3 | .01 |
| CT | 15 ± 5 | −1 ± 6 | <.001 |
| MRI | 25 ± 21 | 0 ± 7 | .02 |
| Radiography | 1 ± 6 | −3 ± 2 | .25 |
| Ultrasound | 13 ± 10 | 4 ± 7 | .09 |
All data were statistically analyzed using t tests. A statistically significant result is indicated in boldface type for P < .05, indicating that the growth rate had significantly decreased between 2004 to 2012 and 1996 to 2003.
