Table 3.

Average Escherichia coli absolute abundance (CFU/100 ml) per station and per month on the Tryptone Bile X-glucuronide (TBX) medium.

		$\bar{\mathrm{X}}$a	SDb	SD/$\bar{\mathrm{X}}$c
Sampling areas	Lake of Péronnes	120	157	1.3
	Lake of Marlette	255	394	1.5
	Lake of Neufchâteau	1594	1870	1.2
	Jambes	428	345	0.8
	Bouillon	590	663	1.1
	Récréalle	472	489	1.0
	Chiny	964	672	0.7
	Houyet	1807	1928	1.1
	Pont à Lesse	1574	1338	0.8
Months	April	165	281	1.7
	May	1912	1976	1.0
	June	350	2055	5.9
	July	1265	1673	1.3
	August	870	1790	2.1
	September	645	1882	2.9

^aAverage E. coli absolute abundance.

^bStandard deviation.

^cStandard deviation divided by the average of E. coli absolute abundance.