Group1	Group2	Group1 mean	Group1 std	Group2 mean	Group2 std	t stat	p-value
firm	NA	496.522055666	105.401230171	478.536321597	51.5850164835	0.354323299546	1.0
NA	bact	478.536321597	51.5850164835	536.052126214	94.6711519104	-1.3063791652	0.597
firm	bact	496.522055666	105.401230171	536.052126214	94.6711519104	-1.43279068738	0.498
