Table 2. Cost efficiency analysis.

	Costs (£)	Hands on time (hrs)	Theoretical detection limit (cells)	Soil analytical sensitivity1 (cells g−1)	Cost - efficiency score	Faeces analytical sensitivity1 (cells g−1)	Cost - efficiency score
QIAamp stool kit	4.78	5.18	4×102	1.83×106	30	8.5×108	43
Powersoil™	4.65	5.01	4×102	8.5×108	28	8.5×108	42
Ultraclean™	3	4.28	1×102	3.95×105	17	4.25×108	26
FastDNA® Spin Kit	4.05	4.57	2×102	8.5×104	20	1.9×107	29
Griffiths	2.78	2.51	1×102	8.5×104	14	1.9×106	17
Modified FastDNA® Spin Kit 0.1 g	4.05	4.57	1×103	4.25×105	23	4.25×106	27
Modified Griffiths 0.1 g	2.78	2.51	5×102	4.25×106	18	4.25×105	16

Lower scores indicate greater cost-effectiveness. ¹Data are expressed as geometric means of either the three soil types or the two faecal types analytical sensitivities, respectively.