Table 1.

Kendall correlation, as Tau-b value and respective P-values, between the number of larvae/eggs and the quantitative qPCR method for each soil-transmitted helminth for NHM and BCM assays

Species	Kendall Tau-b values: egg/larvae versus qPCR method
	NHM	P-value	BCM	P-value
Ancylostoma duodenale	0.41	0.44	0.41	0.44
Ascaris lumbricoides	0.60	< 0.01	0.63	< 0.01
Necator americanus	0	1	−0.81	0.12
Strongyloides stercoralis	0.48	< 0.01	0.65	< 0.01
Trichuris trichiura	0.86	< 0.01	0.87	< 0.01

Kendall Tau-b values range between −1 (all pairs discordant) and 1 (all concordant); a higher Tau-b value indicates more concordance than discordant pairs of individual egg counts, and therefore, a higher overall correlation. Interpretation as <  + or −0.10: very weak; + or −0.10 to 0.19: weak; + or −0.20 to 0.29: moderate; and + or −0.30 or above: strong