BMC Public Health

Table 2 The comparison of relative humidity and forestation between cluster areas and non-cluster areas

From: Analysis of the geographic distribution of HFRS in Liaoning Province between 2000 and 2005

Variables	1^st cluster and others		2^nd cluster and non-cluser
	t-value	p-value	t-value	p-value
Forest amount	3.32^a	0.01^a	2.07^a	0.04^a
	3.32^b	0.01^b	1.14^b	0.26^b
Relative humidity	2.44^a	0.02^a	2.05^a	0.046^a
	2.44^b	0.02^b	0.87^b	0.39^b

a Maximum cluster size set at 50% of the study population.
b Maximum cluster size set at 30% of the study population.

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ISSN: 1471-2458

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