Table 4

Association between pain and measured joint space width (mm). Odds ratios (OR) for pain are for different cut off levels of abnormality (for example, ⩽2mm v >2mm)

Width (mm)	0	1	2	3	4	5	6	7	8	9	10
PFJ lateral
OR	8.9	6.9	5.5	2.9	1.7	1.1	1.4	1.6	0	0	4-150
Sensitivity	11.3	14.2	17.5	25.1	36.8	56.6	86.2	97.9	98.7	99.1	100
Specificity	98.5	97.6	96.2	89.6	74.1	44.6	17.8	3.2	0	0	0
Efficiency	54.9	56.9	56.9	57.3	55.4	55.6	52	50.5	49.3	49.5	50
PFJ medial
OR	1.2	1.3	1.5	1.0	0.8	0.8	0.7	0.8	2.2	1.2	4-150
Sensitivity	5.0	5.8	8.7	17.1	31.3	53.5	74.8	91.6	98.7	99.5	100
Specificity	95.7	95.3	93.8	83.0	65.2	41.3	19.7	7.5	2.8	0.4	0
Efficiency	50.4	50.5	51.3	50.1	48.3	47.4	47.2	49.5	50.7	49.9	50
TFJ lateral
OR	3.6	3.6	1.4	0.9	0.6	0.7	0.7	0.5	0.4	1.1	0
Sensitivity	1.6	1.6	3.3	7.5	19.2	51.4	81.1	94.9	98.7	99.5	100
Specificity	99.5	99.5	97.6	91.5	69.9	40.3	14.0	2.8	0.4	0.4	0
Efficiency	50.5	50.5	50.4	49.5	44.5	45.8	47.5	48.8	49.5	50	50
TFJ medial
OR	4-150	4-150	29.2	4.5	2.0	1.1	0.7	0.3	1.1	0	0
Sensitivity	5.0	7.5	12.1	16.7	39.7	75.7	91.1	98.3	99.5	99.5	99.5
Specificity	100	100	99.5	95.7	75.5	26.2	6.1‘	0.5	0.5	0	0
Efficiency	52.5	53.5	55.8	56.2	57.6	50.9	48.8	49.2	50	49.8	49.8
PFJ narrowest
OR	3.0	3.3	3.0	1.7	1.2	1.0	1.1	1.1	0	4-150	4-150
Sensitivity	12.9	16.3	21.7	32.2	48.1	69.0	90.3	99.1	99.5	100	100
Specificity	95.3	94.3	91.5	77.9	56.3	31.9	10.3	0.9	0	0	0
Efficiency	49.3	50.1	51.0	50.6	49.1	47.7	48.8	50.0	50	50	50
TFJ narrowest
OR	13.2	19.3	5.5	2.1	1.3	1.0	1.4	4-150	4-150	4-150	4-150
Sensitivity	5.8	8.3	13.8	22.1	50.2	86.1	98.3	100	100	100	100
Specificity	99.5	99.5	97.1	88.2	56.8	13.6	2.3	0	0	0	0
Efficiency	52.6	53.9	55.5	55.2	53.5	49.8	50.3	50	50	50	50

↵4-150 Denominator zero therefore unable to calculate simple odds ratios.