Table 6. Result of non-parametric test showing the relationship between five different water quality parameters and the presence/absence of Acanthamoeba spp. in various water sources.

Water quality parameters	Mann-Whitney U test
	TW	PW	WW	LW	StW	SeW
pH value	P = 0,390	P = 0,223	P = 0,004 *	P = 0,692	P = 0,135	P = 0,495
Temperature (°C)	P = 0,744	P = 0,271	P = 0,515	P = 0,235	P = 0,618	P = 0,495
Free Cl (ppm (mg/l))	P = 0,163	P = 1,000	P = 0,118	P = 1,000	P = 0,091	P = 1,000
a EC (0–9990 μs/cm)	P = 0,624	P = 0,002 *	P = 0,146	P = 0,002 *	P = 0,135	P = 0,008 *
b TDS (0–9990 ppm)	P = 0,540	P = 0,002 *	P = 0,051	P = 0,002 *	P = 0,618	P = 0,040 *

^a Electrical conductivity,

^b Total dissolved solids

* Statistically significant p < 0.05

TW: Tap water, PW: Pool water, WW: Well water, LW: Lake water, StW: Stream water, SeW: Seawater