Validating estimates of prevalence of non-communicable diseases based on household surveys: the symptomatic diagnosis study

Table 4 Absolute errors in prevalence estimates from SD method to literature-based approaches

Condition	Test	Absolute error (95% CI)	Symptomatic diagnosis-Tariff method with health care experience absolute error (95% CI)
Asthma	World Health Survey (WHS): Doctor (MD) diagnosis (Dx) [34]	0.023 (0.020, 0.025)	0.014 (0.012, 0.016)
	WHS MD Dx OR asthma medications (Rx) [34]	0.023 (0.020, 0.025)
	WHS MD Dx OR asthma Rx OR wheezing/whistling attacks [34]	0.092 (0.087, 0.095)
Angina pectoris	Rose questionnaire [35,36]	0.082 (0.073, 0.088)	0.020 (0.018, 0.022)
Depression	Composite international diagnostic interview questionnaire [37]	0.059 (0.054, 0.064)	0.016 (0.015, 0.017)

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