Table 4

Determinants of diagnostic disagreement

Variables^4-150		Univariate analysis^†				Multivariate logistic regression analysis^†
Variables^4-150		OR	95% CI			OR	95% CI
Sex (male = 0, female = 1)	1.0	0.6, 1.9
Age (⩽55 = 0, >55 = 1)	1.1	0.6, 2.2
Ethnicity (white = 0, non-white = 1)	1.0	0.4, 2.1
Bilateral involvement (no = 0, yes = 1)	2.2^¶	1.2, 4.2		1.9	1.0, 3.7
Duration of complaints (⩽6 months = 0, >6 months = 1)	1.9^¶	1.0, 3.4		2.0	1.1, 3.7
Previous episode(s) of shoulder pain (no = 0, yes = 1)	0.7^¶	0.4, 1.2
Neck pain present (no = 0, yes = 1)	1.6^¶	0.9, 2.9
Normal activities possible (yes = 0, no = 1)	1.0	0.6, 1.8
Able to lie on the involved shoulder (yes = 0, no = 1)	0.9	0.5, 1.6
Waking up (no = 0, yes = 1)	1.6^¶	0.9, 3.0
Cannot fall asleep (no = 0, yes = 1)	1.5^¶	0.8, 2.7
Pain during rest (no = 0, yes = 1)	1.2	0.7, 2.1
Pain at night (VAS score ⩽76 = 0, >76 = 1)^‡	1.8^¶	0.9, 3.4
Pain during the day (VAS score ⩽75 = 0, >75 = 1)^‡	1.7^¶	0.9, 3.2
Functional status (score on SDQ ⩽87 = 0, >87 = 1)	1.2	0.6, 2.3
Severity of pain (VAS score ⩽72 = 0, >72 = 1)^§	2.7^¶	1.4, 5.2		2.7	1.3, 5.3
Depression (score on SAQ-N ⩽41 = 0, >41 = 1)	1.6^¶	0.8, 3.3
Anxiety (score on SAQ-N ⩽47 = 0, >47 = 1)	1.6^¶	0.8, 3.3
Anger (score on SAQ-N ⩽21 = 0, >21 = 1)	1.7^¶	0.9, 3.2
Optimism (score on SAQ-N >27 = 0, ⩽27 = 1)	0.8	0.4, 1.6

↵4-150 As the continuous variables were not linearly related to disagreement, the value of the 75th percentile was used to form dichotomised sub-groups. ^†The dependent variable was defined to be 0 if the observers agreed on the diagnosis, and 1 if they did not.^‡Severity of pain assessed by the patient. ^§Severity of pain assessed by both examiners on a VAS. The 75th percentile of the mean score of both examiners was included in the analysis. ^¶Variables with p<0.25 for the χ² test were considered as candidates for multivariate logistic regression.