Table 4.

Predictive factors of recent exposure to Plasmodium falciparum and/or Plasmodium vivax in the study area between survey 1 and survey 6

	Exposure any species (N = 301)				Exposure P. falciparum (N = 302)				Exposure P. vivax (N = 314)
	Proportion (%)	aOR	95% CI	p value	Proportion (%)	aOR	95% CI	p value	Proportion (%)	aOR	95% CI	p value
Village				0.004		NS						0.057
Xe Xua	11.0	1.00			7.1				7.2	1.00
Tak Lang	6.3	1.14	[0.2–5.9]		6.3				0.0	8.1E−07
Tu Nak west	30.0	5.07	[1.8–14.1]		12.0				21.2	3.64	[1.2–11.2]
Tu Nak east	12.0	0.96	[0.3–2.7]		17.3				5.3	0.87	[0.2–3.2]
Age group (years)				0.032				0.032				0.163
6–20a	7.8	1.00			0.9	1.00			6.8	1.00
0.5–5	4.2	0.25	[0.01–4.5]		0.0	2.58E−06			3.9	0.54	[0.1–2.3]
21–40	16.7	6.17	[0.5–81.2]		9.7	28.38	[0.1–11,511]		6.6	1.29	[0.3–5.2]
41–60	41.4	15.83	[1.1–231]		41.4	138.0	[0.3–59,721]		16.7	2.21	[0.5–10.1]
61–90	46.2	12.73	[0.9–181]		46.2	174.2	[0.4–79,207]		30.8	4.51	[1.0–20.8]
Occupation				0.441				0.973		NS
School	7.3	1.00			0.9	1.00			6.4
Farmer	24.6	0.52	[0.04–6.7]		20.2	0.49	[0.001–198]		11.9
Other	7.2	2.85	[0.2–42.1]		1.4	0.49	[0.001–362]		5.4
House structure				0.047				0.031		NS
On ground	28.1	1.00			21.2	1.00			11.4
On stilts	12.3	0.34	[0.1–1.0]		7.1	0.23	[0.1–0.9]		7.5
Reported bednet use				0.005				0.004		NS
Always	7.8	1.00			3.6	1.00			5.1
Sometimes	21.5	3.20	[1.4–7.1]		14.8	5.25	[1.7–16.4]		11.7
Total number of nights spent in the field		1.02	[1.0–1.1]	0.173		1.02	[0.98–1.1]	0.268		1.03	[1.0–1.1]	0.095
Working in the field during the study		NS				NS				0.41	[0.1–1.4]	0.158
Number of surveys attended		NS				NS				1.56	[0.9–2.7]	0.111
Proportion of bednets in the household		NS				NS				0.05	[0.0–1.5]	0.086

Italic values indicate significant p values

NS not significant in univariate analysis, therefore not included in multivariate model

^aThe age group of 6–20 years old was used as the reference group as it contained the largest number of individuals