Health status in routine clinical practice: validity of the clinical COPD questionnaire at the individual patient level

Table 2 Agreement between patient, treating clinician and reviewing clinicians.

Agreement between:	Statistics	CCC	Precision	Accuracy	TDI 0.9	CP 0.4
Patient & Treating clinician	Estimate	0.87	0.88	0.98	0.7	0.62
	95% Conf. Limit	0.79	0.81	0.94	0.9	0.53
Patient & Mean reviewing clinicians	Estimate	0.86	0.87	0.99	0.7	0.63
	95% Conf. Limit	0.79	0.80	0.94	0.9	0.54
Treating clinician & Mean reviewing clinicians	Estimate	0.74	0.76	0.97	1.0	0.50
	95% Conf. Limit	0.61	0.63	0.89	1.1	0.42

95% Conf. Limit: 95% confidence limit. CCC: concordance Correlation Coefficient, TDI_0.9: A total deviation index of 0.9 (TDI 0.9) represents the distance (percentile) that captures 90% of the differences in scores between the treating clinician and the patient. A TDI 0.9 of 0.7 means that in 90% of the cases the patient and treating clinician score the patient status within 0.7 distance. CP_0.4 Coverage Probability, proportion of cases within the Minimal Clinically Important difference of 0.4.

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