The Swindon Foot and Ankle Questionnaire: Is a Picture Worth a Thousand Words?

Table 5

Sensitivity and specificity thresholds of SFAQ.

Score	% patients needing; new; intervention	Score	% patients needing; new; intervention	Threshold	Sensitivity	Specificity	Positive; predictive value	Negative; predictive value
0	38%	≥1	54%	≥1	0.97	0.18	0.48	0.88
≤1	45%	≥2	48%	≥2	0.87	0.28	0.48	0.73
≤2	40%	≥3	51%	≥3	0.77	0.41	0.51	0.7
≤3	31%	≥4	54%	≥4	0.69	0.54	0.69	0.54
≤4	35%	≥5	55%	≥5	0.57	0.63	0.55	0.66
≤5	37%	≥6	57%	≥6	0.44	0.74	0.57	0.63
≤6	39%	≥7	63%	≥7	0.31	0.86	0.63	0.61
≤7	42%	≥8	70%	≥8	0.11	0.96	0.7	0.58