Role of community-based active case finding in screening tuberculosis in Yunnan province of China

Table 3 Number needed to screen and tuberculosis incidence proportion or tuberculosis prevalence rate for active and passive case finding strategies in Yunnan, 2013–2015

Year	Screen strategy	Screened enrolled residents under ACF/ Population under PCF, n	TB diagnosed, n	TB incidence proportion/ prevalence ^a	Rate ratio ^b	95% CI of RR^c	NNS ^d
2013	ACF*	33 420	34	101.7	1.7	1.2–2.5	983
2013	PCF*	240 653	143	59.4	ref		1683
2014	ACF	33 285	27	81.1	1.3	0.8–1.9	1233
2014	PCF	242 077	151	62.4	ref		1603
2015	ACF	30 816	5	16.2	0.2	0.08–0.6	6163
2015	PCF	246 177	162	65.8	ref		1520

*ACF = active case finding, PCF = passive case finding; TB = tuberculosis
a: TB Incidence proportion = new TB cases/screened population in ACF area×100 000; TB prevalence = TB cases/population in PCF area×100 000
b: Rate ratio = incidence proportion under ACF/ prevalence under PCF
c: CI = confidence interval; RR = rate ratio
d: NNS = number needed to screen to detect one case

ISSN: 2049-9957