Table 4.

Predictive performance of individual and combinations of criteria

	Occurrence	PPV for major injury [95% CI]	PPV for major or minor injury [95% CI]	PLR for maj or or min or injury [95 % CI]
Positive for 0 of 7 criteria#	813 (18.1%)	2 (0.2%) [0.1-0.7%]	56 (6.9%) [5.3-8.8]	0.17 [0.1 3-0.26]
Positive for 1 criterion (not abnormal CXR) #	1523 (29.5%)	17 (1.1%) [0.1-1.8]	256 (16.8%) [15.2-18.6%]	0.50 [0.4 4-0.56]
Only abnormal CXR#	140 (3.1%)	18 (12.9%) [8.3-19.4]	85 (60.7%) [52.2-68.6%]	3.59 [2.5 4-5.08]
Positive for 2 criteria (not abnormal CXR) #	1040 (20.1%)	33 (3.2%) [2.3-4.4%]	265 (25.5%) [23.1-28.0%]	0.84 [0.7 4-0.96]
Positive for abnormal CXR + 1 other criterion*	254 (5.6%)	47 (18.5%) [14.2- 23.7%]	166 (65.4%) [59.3-71.0%]	4.38 [3.3 9-5.68]
Positive for 3 criteria (not abnormal CXR) #	513 (11.4)	14 (2.7%) [1.6-4.5%]	179 (34.9%) [31.0-39.0]	1.32 [1.1 2-1.66]
Positive for abnormal CXR + 2 other criteria*	251 (5.6%)	62 (24.7%) [19.8-30.4]	205 (81.7%) [76.4-86.1%]	10.3 5 [7.5 0-14.3 6]

PPV = positive predictive value; MCI = major clinical injury; CXR = chest x-ray; CI = confidence interval

^*Calculations for these criteria were based on all patients who had CT (N = 5169).

^#Calculations for these criteria were based on all patients who had both CXR and CT (N = 4501).

7 criteria = Sternal tenderness, Scapular tenderness, Chest wall tenderness, Thoracic spine tenderness, Distracting injury, Rapid deceleration, abnormal CXR.