Characterization of Plasmodium falciparum and Plasmodium vivax recent exposure in an area of significantly decreased transmission intensity in Central Vietnam

Table 3 Predictive factors of seropositivity against any species of malaria parasites (Plasmodium falciparum and/or Plasmodium vivax) in the study area at survey 1 and survey 6

	Seropositivity S1				Seropositivity S6
	Proportion (%)	aOR	95% CI	p value	Proportion (%)	aOR	95% CI	p value
Village				0.0336				0.7022
Xe Xua	56.9	1.00			51.6	1.00
Tu Nak	40.4	432.80	[0.5–403,860]		56.9	1.12	[0.6–2.2]
Tak Lang	44.4	0.02	[0.001–0.6]		31.3	0.70	[0.2–2.1]
Age group (years)				< 0.0001				0.0001
0.5–10	18.8	1.00			26.7	1.00
11–25	47.1	1.99	[0.8–5]		46.7	1.31	[0.5–3.3]
> 25	87.9	17.38	[5–58]		92.6	16.96	[4.0–71.2]
Occupation				0.0009				0.1167
School	33.9	1.00			33.0	1.00
Farmer	78.2	1.83	[0.7–5]		86.0	2.01	[0.6–6.6]
Other	7.7	0.13	[0.04–0.4]		24.3	0.54	[0.2–1.2]
Main material of roof				0.738		NS
Leaves	36.4	1.00
Aluminium (tole)	50.3	1.09	[0.7–2]
Education		0.95	[0.8–1.1]	0.477		NS
Household		1.04	[1.0–1.1]	0.045		NS
House structure		NS						0.01
On ground					82.4	1.00
On stilts					48.1	0.24	[0.1–0.7]
Nr of buffaloes owned		NS				0.63	[0.4–0.9]	0.021
Total number of bednets in the household		NS				0.72	[0.5–1.0]	0.051
Total number of nights spent in the field		NA				1.00	[1.0–1.0]	0.854
Working in the forest during the study		NA				0.55	[0.2–1.5]	0.255
Total number of nights spent in the forest		NA				1.93	[0.6–6.5]	0.286
Having slept in another cluster during the study		NA				0.98	[0.3–3.1]	0.973

Italic values indicate significant p values
NS not significant in univariate analysis, therefore not included in multivariate model; NA variable measured during survey, therefore not relevant for seropositivity at survey 1

ISSN: 1475-2875