Table 3.

AUC, sensitivity, specificity, PPV, and NPV of the SQST in the detection of lateral stenosis.

Variables	AUC	Sensitivity	Specificity	PPV	NPV
Low Strength von frey	0.82 (0.72–0.93)	0.82 (0.72–3.93)	0.92 (0.84–1.01)	0.84 (0.68–1.01)	0.85(0.75–0.96)
High Strength von frey	0.85 (0.75–0.95)	0.73 (0.54–0.91)	0.97 (0.92–1.03)	0.94 (0.83–1.05)	0.86 (0.76–0.96)
Pinprick	0.77 (0.67–0.88)	0.55 (0.34–0.75)	1.00 (1.00–1.00)	1.00 (1.00–1.00)	0.79 (0.68–0.91)
Brush	0.73 (0.62–0.83)	0.46 (0.25–0.66)	1.00 ((1.00–1.00)	1.00 (1.00–1.00)	0.76 (0.76–0.88)
Blunt	0.78 (0.67–0.89)	0.59 (0.39–0.80)	0.97 (0.92–1.03)	0.93 (0.79–1.06)	0.80 (0.69–0.99)
Vibration	0.76 (0.64–0.87)	0.59 (0.39–0.80)	0.92 (0.94–1.01)	0.81 (0.62–1.00)	0.80 (0.68–0.92)
Warm	0.83 (0.73–0.93)	0.68 (0.49–0.88)	0.97 (0.92–1.03)	0.94 (0.82–1.06)	0.84 (0.73–0.95)
Cold	0.73 (0.61–0.85)	0.59 (0.39–0.80)	0.87 (0.76–0.98)	0.72 (0.52–0.93)	0.79 (0.66–0.91)

AUC, area under the curve; PPV, positive predictive value; NPV, negative predictive value; SQST, standardised qualitative sensory test; SLRT, straight leg rising test. Corresponding 95% confidence intervals are in parentheses.