Table 4.

Summary statistics of detected coliphage densities in ambient waters. All values are log₁₀ PFU/L.

		Total (MSC | Somatic)
		Number of detected observations	Mean	Median	Standard Deviation
Total observations		887 (515 |372)	2.77 (2.20 | 3.56)	2.52 (2.06 | 3.76)	1.22 (0.91 | 1.16)
Observations by geographic region	North America	173 (118 | 55)	2.24 (2.19 | 2.34)	2.26 (2.24 | 2.29)	0.77 (0.75 | 0.80)
	Europe	347 (112 | 235)	3.53 (2.58 | 3.98)	3.78 (2.46 | 4.12)	1.28 (1.31 | 0.98)
	Asia	60 (45 | 15)	3.27 (3.16 | 3.59)	2.90 (2.90 | 2.77)	1.03 (0.70 | 1.68)
	South America	35 (- |35)	3.46 ( - | 3.46)	3.41 (- | 3.41)	0.62 ( - | 0.62)
	Oceania	272 (240 | 32)	1.95 (1.85 | 2.66)	1.82 (1.77 | 2.37)	0.65 (0.52 | 1.04)
Observations by season	Spring	64 (52 | 12)	2.64 (2.21 | 4.49)	2.28 (2.13 | 4.88)	1.45 (0.95 | 1.81)
	Summer	93 (80 |13)	2.63 (2.30 | 4.71)	2.26 (2.00 | 4.54)	1.51 (1.20 | 1.59)
	Fall	60 (33 | 27)	3.11 (3.16 | 3.06)	2.73 (3.00 | 2.47)	1.30 (1.20 | 1.51)
	Winter	173 (88 | 85)	2.62 (2.49 | 2.75)	2.45 (2.48 | 2.41)	1.14 (0.91 | 1.34)

^aMSC = male-specific coliphage.