Soil-transmitted helminths, intestinal protozoa and Clonorchis sinensis infections in southeast China

BMC Infectious Diseases

Table 3 Prevalence of helminth infection

Parasite	The NO. and prevalence of infection
	Rural area		Urban area		χ²/χ_c²	p	Total
	N	%	N	%	χ²/χ_c²	p	N	%
Any intestinal helminth	406	2.04	18	0.50			424	1.80
STH	387	1.94	16	0.44	40.90	< 0.05	403	1.71
Hookworm	357	1.79	16	0.44	35.72	< 0.05	373	1.58
T. trichiura	20	0.10	0	0	6.67^a	0.01	20	0.08
A. lumbricoides	13	0.07	0	0	4.34^a	0.04	13	0.06
Fertilized egg	8	0.04	0	0	2.67^a	0.10	8	0.03
Unfertilized egg	6	0.03	0	0	/	0.60^b	6	0.03
T. trichiura & A. lumbricoides	3	0.02	0	0	/	1.00^b	3	0.01
C. sinensis	1	0.01	0	0	/	1.00^b	1	0.004
Fasciolopsis buski	0	0	2	0.06	/	0.02^b	2	0.01
Pinworm (anal swab)	18	2.79	NA	NA	NA	NA	18	2.79

NA, not available
^aIf theoretical frequency (T) in the table was between 1 and 5, correction for continuity (Yate’s correction) was performed with χ_c²
^bIf T in the table was less than 1, exact probability method was used with only Fisher’s exact P

ISSN: 1471-2334