Table 5.

Multivariable analysis of the selected risk factors associated with the seroprevalence after the univariate analysis and AIC model selection procedure

	Plasmodium falciparum			Plasmodium vivax
Malariometric variable	CSP	Pf.MSP1.19	Pf.GLURP.R2	PvAMA1	Pv.MSP1.19
Variable level	IRR [LCI–UCI]	IRR [LCI–UCI]	IRR [LCI–UCI]	IRR [LCI–UCI]	IRR [LCI–UCI]
Age (years)
2–5	Reference	Reference	Reference	Reference	Reference
6–15	1.44 [1.33–1.57]	1.30 [1.23–1.38]	2.83 [2.54–3.15]	1.40 [1.31–1.50]	1.21 [1.14–1.28]
16–50	5.44 [5.03–5.89]	1.68 [1.59–1.78]	13.33 [12.02–14.77]	1.98 [1.86–2.16]	1.50 [1.42–1.59]
>50	11.82 [10.61–13.15]	2.01 [1.86–2.16]	17.90 [15.55–20.61]	2.79 [2.55–3.05]	1.99 [1.84–2.15]
Gender
Male	Reference	Reference	–	–	Reference
Female	1.06 [1.01–1.12]	1.04 [1.00–1.08]	–	–	1.06 [1.02–1.10]
Ethnicity
Khmer	Reference	Reference	Reference	Reference	Reference
Ethnic Minority (EM)	2.72 [2.38–3.12]	1.33 [1.21–1.47]	3.70 [3.11–4.41]	1.31 [1.17–1.47]	1.18 [1.07–1.31]
Overnight plothut
No	Reference	Reference	Reference	–	Reference
Yes	1.12 [1.06–1.19]	1.07 [1.03–1.11]	1.24 [1.15–1.33]	–	1.04 [1.00–1.09]
Overnight forest
No	Reference	–	–	–	Reference
Yes	1.14 [1.05–1.23]	–	–	–	1.07 [1.01–1.14]

^a IRR Incidence rate ratio that indicates for how much (if > 1) or less (if < 1) the risk factors affect the data obtained in survey 2 (2012) and survey 4 (2013). This is performed in respect to the reference category and LCI and UCI representing the lower and upper 95 % confidence intervals based on the total sample size of n = 6 502 individuals from 98 communities. p-value <0.10. Missing values were not significant