Table 2. The five trials used to validate the outcome of the classification trees.

Country (number of subjects, prevalence of STH)	Mean pre-DA FEC (EPG)	k	FECRT	Threshold of 90%		Threshold of 95%
				Required	Predicted	Required	Predicted
Brazil (n = 350, 30.6%)
A. lumbricoides	1,353	0.063	100	17	50–200	17	50–200
Hookworm	101	0.097	97.5	30	10–49	176	50–200
Cambodia (n = 1,026, 31.9%)
Hookworm	183	0.121	97.6	20	10–49	75	50–200
Cameroon (n = 1,485, 44.1% )
A. lumbricoides	2,906	0.061	99.2	12	50–200	15	50–200
T. trichiura	331	0.042	39.2	32	50–200	22	50–200
Hookworm	59	0.015	93.0	4405	>200	>5000	50–200
Ethiopia (n = 410, 61.0%)
A. lumbricoides	1,293	0.083	100	7	10–49	7	50–200
T. trichiura	110	0.065	92.4	1152	>200	1099	50–200
Hookworm	74	0.144	99.7	12	10–49	14	50–200
Tanzania (n = 509, 95.3%)
A. lumbricoides	2,697	0.264	100	3	10–49	4	50–200
T. trichiura	832	0.781	52.0	6	10–49	4	50–200
Hookworm	706	0.572	95.3	78	10–49	>5000	>200

Cases highlighted in bold indicate an agreement between the required and the predicted sample size (the required sample size fell within the sample size interval predicted). Cases highlighted in italic indicate an underestimation of the required sample size (required sample size > upper limit of the predicted sample size interval). In the remaining cases, the required sample size was overestimated (required sample size > lower limit of the predicted sample size).