Agreement between a self-administered questionnaire on musculoskeletal disorders of the neck-shoulder region and a physical examination

Table 5 Effect of time elapsed between the administrations of the questionnaire and the physical examination⁽¹⁾ (n = 187)

Time elapsed	Global agreement			Agreement among cases⁽²⁾	Agreement among non-cases ⁽³⁾	Sn	Sp
	Kappa	95% CI	%⁽⁴⁾	%⁽⁴⁾	%⁽⁴⁾	%	%
≤ 21 days (n = 92)	0.54	0.37–0.716	77	83	71	75	80
>21 days (n = 95)	0.33	0.15–0.52	66	74	61	56	78

Abbreviations: Sn = sensitivity; Sp = specificity
⁽¹⁾ Primary definitions were used in estimating the agreement.
⁽²⁾ Cases based on questionnaire definition. Agreement among cases corresponds to the positive predictive value.
⁽³⁾ Non-cases based on questionnaire definition. Agreement among non-cases corresponds to the negative predictive value.
⁽⁴⁾ None of the comparisons reached statistical significance (χ² test).

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