Table 3. Sensitivity Analysis.

				estimated annual risk (percentile)
pathogen	fixed parameter	fixed Value	units	10th (%)	50th (%)	90th (%)
G. duodenalis	soil ingestion	10	mg/day	2.7	4.4	8.1
		100		24	36	57
		1000		93	99	>99
	gene copy density	10	gene copies/gram soil	2.6	3.7	5.3
		100		23	32	43
		1000		92	98	>99
	viability	0.01%	% viable cysts	0.51	0.65	0.92
		0.10%		5.0	6.4	8.8
		1%		40	48	60
		10%		>99	>99	>99
	dose–response parameter k	0.00995	unitless	31	46	78
		0.0199		53	71	95
		0.0398		78	92	>99
Shigella/EIEC	soil ingestion	10	mg/day	1.2	1.9	3.3
		100		11	17	27
		1000		65	78	88
	gene copy density	10	gene copies/gram soil	0.60	0.89	1.3
		100		5.8	8.4	12
		1000		43	55	66
	viability	0.01%	% viable CFUs	0.22	0.29	0.43
		0.10%		2.2	2.8	4.1
		1%		20	24	32
		10%		87	91	95
	dose–response parameter N50	740	CFUs	42	56	72
		1480		25	35	50
		2960		13	20	31

^aResults from sensitivity analysis that held individual parameters constant as part of the stochastic QMRA model.