Table 1.

Characteristics of study population and univariate analysis of malaria risk factors

	Sampovloun					Koh Kong					Preah Vihear
	Surveyed		P. spp. positive			Surveyed		P. spp. positive			Surveyed		P. spp. positive
	No	%	No	%	p	No	%	No	%	p	No	%	No	%	p
No of villages	27					38					23
No of individuals	4074		123	3.0		2624		184	7.0		4954		610	12.3
Age
< 5 years	363	8.9	4	1.1	< 0.001	229	8.7	7	3.1	< 0.001	922	18.6	112	12.2	0.002
5–14 years	1586	38.9	26	1.6		915	34.9	79	8.6		1748	35.3	242	13.8
15–39 years	1434	35.2	76	5.3		966	36.8	78	8.1		1739	35.1	214	12.3
≥ 40 years	691	17.0	17	2.5		514	19.6	20	3.9		545	11.0	42	7.7
Gender
female	2258	55.4	43	1.9	< 0.001	1513	57.7	83	5.5	< 0.001	2938	59.3	323	11.0	0.001
male	1816	44.6	80	4.4		1111	42.3	101	9.1		2016	40.7	287	14.2
Occupation*
inside village	2183	53.6	35	1.6	< 0.001	1216	46.3	81	6.7	0.023	2910	58.7	378	13.0	0.07
outside village	1764	43.3	88	5.0		1027	39.1	95	9.3		2015	40.7	227	11.3
Bednet use
Yes	3996	98.1	117	2.9	0.015	2569	97.9	180	7.0	0.939	4313	87.1	496	11.5	< 0.001
no	78	1.9	6	7.7		55	2.1	4	7.3		641	12.9	114	17.8

* unclassified occupations were excluded

The age, gender, occupation and bed-net use distribution is shown for the surveyed population (representing 7.7%, 1.9% and 4.0% of the population covered by the public health system in Sampovloun, Koh Kong and Preah Vihear, respectively), and for the individuals testing positive for Plasmodium by microscopy. P values from a univariate analysis of malaria prevalence distribution in each area are also shown.