Shoulder pain in primary care: diagnostic accuracy of clinical examination tests for non-traumatic acromioclavicular joint pain

Table 5 Diagnostic accuracy of individual history and physical examination variables for a positive response to acromioclavicular joint diagnostic block

Clinical examination variables	Cell counts				Diagnostic accuracy
	TP	FN	FP	TN	Sensitivity(95% CI)	Specificity(95% CI)	PPV (95% CI)	NPV (95% CI)	LR+ (95% CI)	LR- (95% CI)	OR (95% CI)
Onset: repetitive activity	6	16	13	118	0.27 (0.13, 0.48)	0.90 (0.84, 0.94)	0.32 (0.15, 0.54)	0.88 (0.82, 0.93)	2.75 (1.15, 6.07)	0.81 (0.57, 0.98)	3.4* (1.1, 10.2)
No pain referred below elbow	20	0	105	23	1.00 (0.84, 1.00)	0.18 (0.12, 0.26)	0.16 (0.11, 0.23)	1.00 (0.86, 1.00)	1.22 (1.18, 1.34)	0.00 (0.00, 0.92)	0.84* (0.78, 0.91)
ACJ thickened or swollen	15	5	47	77	0.75 (0.53, 0.89)	0.62 (0.53, 0.70)	0.24 (0.15, 0.36)	0.94 (0.87, 0.97)	1.98 (1.33, 2.70)	0.40 (0.28, 0.77)	4.9** (1.7, 14.4)
PROM GHJ abduction – no pain	8	14	18	108	0.36 (0.20, 0.57)	0.86 (0.79, 0.91)	0.31 (0.17, 0.50)	0.89 (0.82, 0.93)	2.55 (1.23, 4.86)	0.74 (0.50, 0.95)	3.4* (1.3, 9.3)
PROM ER90⁰ – no pain	11	11	23	107	0.50 (0.31, 0.69)	0.82 (0.75, 0.88)	0.32 (0.19, 0.49)	0.91 (0.84, 0.95)	2.83 (1.56, 4.76)	0.61 (0.37, 0.85)	4.7** (1.8, 12.0)

Abbreviations. TP, true positives; FN, false negatives; FP, false positives; TN, true negatives; CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value; LR+, positive likelihood ratio; LR-, negative likelihood ratio; OR, odds ratio; ACJ, acromioclavicular joint; PROM, passive range of motion; GHJ, glenohumeral joint; ER 90°, external rotation performed in 90° of abduction.
Note. Cell counts do not total 153 in some cases due to missing data.
*P< 0.05; ** P< 0.01.

ISSN: 1471-2474