Table 2.

Prevalence (%) and infection rate (%) of each organism among three schools

Organism	Number of overall infections (%) (N = 263)	Number of infections by school (%)			P value*
		KK (N = 147)	BR (N = 53)	HK (N = 63)
Blastocystis hominis	46 (17.5)	19 (12.9)	6 (11.3)	21 (33.3)	0.001
Endolimax nana	12 (4.6)	5 (3.4)	4 (7.5)	3 (4.7)	0.462
Entamoeba coli	9 (3.4)	7 (4.8)	2 (3.8)	0 (0.0)	0.218
Entamoeba histolytica/Entamoeba dispar	3 (1.1)	1 (0.7)	1 (1.9)	1 (1.6)	0.723
Giardia intestinalis	2 (0.8)	1 (0.7)	1 (1.9)	0 (0.0)	0.500
Strongyloides stercoralis	4 (1.5)	2 (1.4)	1 (1.9)	1 (1.6)	0.963
Opisthorchis viverrini	1 (0.4)	1 (0.7)	0 (0.0)	0 (0.0)	0.673

^*Chi-square test for the infection rate by schools.