Table 3.

Statistical Parameters for the Studied Clinical Measures

Parameters	FPI-6 n = 920	CA n =920
ICC (95% CI)	0.963 (0.952–0.983)	0.997 (0.996–0.998)
Sensitivity	84%	98%
Specificity	80%	99%
AUC (95% CI)	0.80 (0.77–0.85)	0.98 (0.95–1.00)
PV+	64%	98%
PV−	92%	98.9%
LR+	4.21	97
LR-	0.20	0.02
Pretest probability	30%	30%
Posttest probability (LR+) [95% CI]	64% [59–66%]	98% [94–99%]
Posttest probability (LR-) [95% CI]	8% [3–9%]	1% [0–2%]

Abbreviations: FPI-6, foot posture index-6; CA, Clarke’s angle; ICC, Intraclass correlation coefficient; 95% CI, 95% confidence interval; AUC, area under the ROC curve; PV+, positive predictive value; PV−, negative predictive value; LR+, positive likelihood ratio; LR-, negative likelihood ratio.