Table 2.

Mean duration of emergency department treatment (in min) stratified according to ISS quartiles and periods of observation.

	January 2000 to April 2002	May 2002 to December 2007
ISS quartile	Pan-scan not available	Pan-scan available but not performed	Pan-scan performed
First, 0 to 18	173.9 (147.1 to 200.8)	96.9 (84.0 to 109.7)	85.1 (77.0 to 93.1)
Second, 19 to 25	145.7 (122.3 to 169.1)	99.1 (85.0 to 113.1)	89.8 (80.8 to 98.7)
Third, 26 to 33	137.4 (95.9 to 178.8)	113.8 (79.3 to 148.4)	83.4 (74.1 to 92.7)
Fourth, 34 to 75	112.8 (87.6 to 138.1)	50.7 (33.3 to 68.2)	76.3 (70.2 to 82.4)

Values in parentheses are 95% CI. In first approximation, a significant difference in the mean duration of emergency department time at the 5% threshold between individual subgroups can be assumed if 95% confidence limits do not overlap.

ISS, Injury Severity Score.