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Table 4 Incidence rate of malaria with symptoms by TBS among participants enrolled in malaria incidence study on Bioko Island, Equatorial Guinea

From: Incidence of Plasmodium falciparum malaria infection in 6-month to 45-year-olds on selected areas of Bioko Island, Equatorial Guinea

  n Events Proportion positive (95% CI) Incidence ratea (95% CI)
All clinical infections
Total 240 31 0.13 (0.09, 0.18) 0.14 (0.09, 0.19)
First clinical infections
Total 240 27 0.11 (0.08, 0.16) 0.13 (0.09, 0.19)
Age group
 6 to 59 months 79 12 0.15 (0.09, 0.25) 0.16 (0.09, 0.30)
 5 to 17 years 81 7 0.09 (0.04, 0.17) 0.10 (0.05, 0.22)
 18 to 45 years 80 8 0.10 (0.05, 0.19) 0.11 (0.06, 0.22)
Sex
 Male 114 14 0.12 (0.07, 0.19) 0.15 (0.09, 0.25)
 Female 126 13 0.10 (0.06, 0.17) 0.11 (0.07, 0.20)
Area
 Area I 53 5 0.09 (0.04, 0.21) 0.10 (0.04, 0.24)
 Area II 63 4 0.06 (0.02, 0.16) 0.06 (0.03, 0.18)
 Area III 59 6 0.10 (0.04, 0.21) 0.12 (0.05, 0.27)
 Area IV 65 12 0.18 (0.11, 0.30) 0.23 (0.13, 0.41)
TBS positive before enrollmentb
 Yes 15 1 0.07(0.01, 0.41) 0.08 (0.01, 0.59)
 No 225 26 0.12 (0.08, 0.16) 0.13 (0.09, 0.19)
Household SES2
 Lower 68 6 0.09 (0.04, 0.18) 0.10 (0.04, 0.24)
 Upper lower 31 8 0.26(0.13, 0.45) 0.30 (0.15, 0.62)
 Middle 51 6 0.12 (0.05, 0.24) 0.13 (0.06, 0.29)
 Upper middle 43 5 0.12 (0.05, 0.26) 0.14 (0.06, 0.35)
 Upper 47 2 0.04 (0.01, 0.16) 0.04 (0.01, 0.18)
Travelc
 Yes 18 3 0.17 (0.05, 0.51) 0.26 (0.08, 0.81)
 No 221 24 0.11 (0.07, 0.15) 0.12 (0.08, 0.18)
  1. aRate per 24 weeks
  2. bMalaria positive at screening or between screening and enrollment (within 2 months before enrolled into the study), however all participants were given presumptive treatment and retested before the day of initiation of the study
  3. cYes, if a person travels at least once at any time point during the study