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Table 2 Random effects logistic regression results assessing, among RCD participants, the association between risk factors and testing positive for a malaria infection during a case investigation

From: The use of spatial and genetic tools to assess Plasmodium falciparum transmission in Lusaka, Zambia between 2011 and 2015

VariableFactorUnadjusted IRR (95% CI)P valueAdjusted IRR (95% CI)P-value
Season and distance from uninhabited areasDry season > 250 mReferenceReferenceReferenceReference
Dry season and ≤ 250 m1.88 (0.80–4.42)0.1503.74 (0.50–28.13)0.200
Wet season and > 250 m2.06 (0.85–5.03)0.1506.16 (0.76–49.77)0.088
Wet season and ≤ 250 m2.27 (1.01–5.09)0.0488.90 (1.31–60.49)0.025
Age of person tested< 5 yearsReferenceReferenceReferenceReference
5–15 years1.74 (1.27–2.39)0.0012.01 (1.29–3.11)0.002
> 15 years1.24 (0.85–1.81)0.2731.47 (0.87–2.46)0.146
Sex of person testedFemaleReferenceReferenceReferenceReference
Male1.11 (0.83–1.49)0.4771.10 (0.74–1.64)0.639
Travel in past 1 monthNoneReferenceReferenceReferenceReference
Outside Lusaka11.06 (5.14–23.80)< 0.000113.65 (6.28–29.64)< 0.0001
Location of householdAdjacent to index caseReferenceReferenceReferenceReference
Index case house4.33 (3.18–5.90)< 0.00014.03 (2.57–6.33)< 0.0001
  1. A total of 11,954 individuals were tested for malaria during 428 case investigations