Validation of AIDS-related mortality in Botswana

Table 2 Misclassification of deaths reported to the Botswana Government, Method A, eight hospitals, 2005

			HIV- and AIDS-related death as determined by physician consensus
			Yes	No	Total
HIV- and AIDS-related death as recorded in the vital registration database	Yes	Unweighted	247	12	259
		Weighted	1459 (True Positives)	71 (False Positives)	1530
	No	Unweighted	485	1083	1568
		Weighted	1159 (False Negatives)	2587 (True Negatives)	3746
	Total	Unweighted	732	1095	1827
		Weighted	2618	2658	5276

Weighted numbers are provided to adjust for the two different sampling fractions employed in this study. Weighting allows for accurate calculations of statistics such as the specificity and sensitivity of the vital registration database. See the Methods section for more details on sampling fractions.