Table 2.

Sensitivity, specificity, positive-predictive value (PPV), negative-predictive value (NPV) and accuracy of different study variables on diffusion-weighted MR sequences in differentiating infectious spondylitis from Modic type 1 change

Parameter	Sensitivity	Specificity	PPV	NPV	Accuracy
Signal intensity
b-value: 50 s mm−2	100	0	27.9	0	27.9
b-value: 400 s mm−2	100	12.9	30.8	100	37.2
b-value: 800 s mm−2	91.7	96.8	91.7	96.8	95.3
ADC (>1.52 × 10−3 mm2 s−1)	91.7	100	100	96.9	97.7
Claw-sign	100	100	100	100	100
Amorphous increased signal	100	100	100	100	100

ADC, apparent diffusion coefficient.

Figures indicate percentage.