Table 2.

Concentrations of L. pneumophila (CFU/L) and P. aeruginosa (CFU/100 mL) in the presence and absence of amoebae.

			Mean ± SD	Min-Max	Median	Interquartile Range
L. pneumophila	Hand-pieces	No amoebae	333.33 ± 405.27	0–1400	200	100–400
		Amoebae	905.56 ± 839.80	0–2700	550	300–1500
	Tap water	No amoebae	321.74 ± 293.81	0–900	300	0–500
		Amoebae	414.29 ± 389.14	0–800	700	0–700
P. aeruginosa	Hand-pieces	No amoebae	46.50 ± 109.30	0–308	0	0–0
		Amoebae	10.89 ± 45.21	0–192	0	0–0