Table 2.

Results of the statistical analysis forClostridiaceae,EnterobacteriaceaeandThermoanaerobacterales(Family III)

Y(H2/S)	Clostridiaceae (n = 464)	Enterobacteriaceae (n = 295)	Thermoanaerobacterales (Family III) (n = 73)
[mol mol-1]
Median	1.785	0.82	2.9
Mean	1.87 ± 1.10*	1.15 ± 1.34*	2.92 ± 1.18*
HER	Clostridiaceae (n = 317)	Enterobacteriaceae (n = 318)	Thermoanaerobacterales (Family III) (n = 38)
[mmol L-1 h-1]
Median	8.67	4.915	9.6
Mean	9.75 ± 8.41	11.37 ± 17.71	8.98 ± 3.40
qH2	Clostridiaceae (n = 70)	Enterobacteriaceae (n = 102)	Thermoanaerobacterales (Family III) (n = 20)
[mmol g-1 h-1]
Median	10.05	3.75	16.615
Mean	14.49 ± 11.24	12.90 ± 26.02	18.61 ± 7.14