Table 4.

Diagnostic accuracy of the individual radiologists’ evaluation of radiographs and MRIs of sacroiliac in relation to the availability of clinical information

	Reader 1 without CI	Reader 1 with CI	Reader 2 without CI	Reader 2 with CI	Reader 3 without CI	Reader 3 with CI
	Radiographs of sacroiliac joints
Precision	76.2%	76.2%	63.4%	64.4%	63.4%	77.2%
Sensitivity	63.6%	56.4%	54.6%	50.9%	38.2%	61.8%
Specificity	91.3%	100%	73.9%	80.4%	93.5%	95.7%
ppV	89.7%	100%	71.4%	75.7%	87.5%	94.4%
npV	67.7%	65.7%	57.6%	57.8%	55.84%	67.7%
Radiologists’ confidence M (SD)	5.3 (1.9)	5.9 (2.2)	4.6 (1.9)	4.8 (2.1)	5.9 (3.3)	7.2 (2.4)
	Radiographs and MRI of sacroiliac joints
Precision	79.8%	81.8%	76.8%	77.8%	82.8%	83.8%
Sensitivity	72.4%	72.4%	79.3%	74.1%	72.4%	72.4%
Specificity	90.2%	95.1%	73.2%	82.9%	97.6%	100%
ppV	91.3%	95.5%	80.7%	86.0%	97.7%	100%
npV	69.8%	71.4%	71.4%	70.9%	69.4%	71.9%
Radiologists’ confidence M (SD)	6.5 (1.5)	6.0 (2.1)	7.4 (2.9)	6.9 (2.1)	5.9 (2.1)	8.8 (2.4)

.M, mean; npv, positive negative value; ppV, positive predictive Value.