Table 4. Correlation between snail distribution and changes in ecological environmental factors, as well as human schistosomiasis infection in Dongting Lake area.

Snail distribution	Ecological environmental factors						Human schistosomiasis infection
	Monitored water level of the bottomlands		Mean elevation range of the bottomlands		Topsoil moisture		Infection rate of schistosomiasis		Number of schistosomiasis patients
	r	p value	r	p value	r	p value	r	p value	r	p value
Occurrence rate of frames with living snails	0.509	0.002	0.274	0.105	0.135	0.433	0.795	<0.001	0.718	0.001
Mean density of living snails	0.588	<0.001	0.374	0.025	0.110	0.524	0.865	<0.001	0.787	<0.001