Table 2.

Iowa SHL data summary. CT/NG diagnoses for 33,811 individuals during 2013, cross-classified by sex and specimen type. Stratum sample sizes are shown. Estimates of , , , and are provided. The values of sensitivity and specificity are taken from the product literature for the Aptima Combo 2 Assay (1 = CT; 2 = NG). The algorithms shown in the last column minimize the expected number of tests per individual

Stratum	Count	CT/NG	Estimate		Sensitivity	Specificity		Algorithms
	18775
Female Swab	1442							H2
	63							AT
	52							H3
	5438
Female Urine	521							H2
	21							AT
	18							H3
	1050
Male Swab	183							H2
	43							AT
	22							H3
	5137
Male Urine	919							H2
	73							AT
	54							H3