Table 1.

Cross-sectional surveys investigating the relationship between adult Opisthorchis viverrini worm burden and faecal egg counts in humans included in the analysis. Surveys TH1–4 and LAO1 had individual-level data used for model fitting. Surveys TH5 and LAO2–3 had aggregated data used for model validation. The table shows the method of adult worm collection, either from liver examination during autopsy or expulsion with a saline purgative after anthelmintic treatment with praziquantel; the study location and date; the number of human participants (sample size); the arithmetic mean number of O. viverrini adult worms recovered; and the diagnostic method used for parasite egg identification and counting. TH relates to surveys in Thailand and LAO to Laos.

survey and method	location and year(s)	sample size	worms recovered			faecal egg diagnostic
			mean	range	s.d.a
TH1 autopsy [34]	Khon Kaen 1982–1999	139	160	0–2954	390	FECTb
TH2 expulsion [35]	Khon Kaen 1987	33	85	0–565	154	Stoll’s dilution
TH3 expulsion [31]	Kalasin 1989	231	39	0–832	105	FECTb
TH4 expulsion [36]	Khon Kaen 1991	141	49	0–874	102	FECTb
LAO1 expulsion [37]	Savannakhet 2005	97	183	0–2178	286	FECTb
TH5 autopsyc [38]	Khon Kaen 1966	9	2588	20–11856	NAd	Stoll’s dilution
LAO2 expulsionc [39]	Savannakhet 2008	125	11	0–111	29	Kato–Katz
LAO3 expulsionc [39]	Savannakhet 2011	82	3	0–66	9	Kato–Katz

^aStandard deviation.

^bFormalin–ether concentration technique.

^cSurvey used for validation only.

^dData not available.