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Table 2 Incidence rate of malaria infection 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 infections
Total 240 58 0.24 (0.19, 0.30) 0.25 (0.19, 0.32)
First infections
Total 240 47 0.19 (0.15, 0.25) 0.23 (0.17, 0.30)
Age group
 6 to 59 months 79 15 0.19 (0.12, 0.29) 0.22 (0.13, 0.36)
 5 to 17 years 81 18 0.22 (0.14, 0.33) 0.26 (0.17, 0.42)
 18 to 45 years 80 14 0.18 (0.11, 0.28) 0.20 (0.12, 0.34)
Sex
 Male 114 29 0.25 (0.18, 0.34) 0.31 (0.22, 0.45)
 Female 126 18 0.14 (0.09, 0.22) 0.16 (0.10, 0.25)
Area
 Area I 53 7 0.13 (0.06, 0.26) 0.14 (0.07, 0.30)
 Area II 63 7 0.11 (0.05, 0.22) 0.12 (0.06, 0.25)
 Area III 59 13 0.22 (0.13, 0.35) 0.26 (0.15, 0.45)
 Area IV 65 20 0.31 (0.21, 0.43) 0.39 (0.25, 0.61)
TBS positive before enrollmentb
 Yes 15 6 0.4 (0.17, 0.68) 0.51 (0.23, 1.12)
 No 225 41 0.18(0.14, 0.24) 0.21 (0.15, 0.29)
Household SES
 Lower 68 14 0.21 (0.12, 0.32) 0.25 (0.15, 0.43)
 Upper lower 31 12 0.39 (0.23, 0.58) 0.46 (0.26, 0.82)
 Middle 51 9 0.18 (0.09, 0.31) 0.20 (0.10, 0.38)
 Upper middle 43 9 0.21 (0.11, 0.36) 0.26 (0.14, 0.50)
 Upper 47 3 0.06 (0.02, 0.19) 0.07 (0.02, 0.20)
Travelc
 Yes 18 5 0.28 (0.11, 0.55) 0.32 (0.13, 0.78)
 No 221 42 0.19 (0.14, 0.25) 0.22 (0.16, 0.3)
  1. aRate per 24 weeks
  2. bMalaria positive by [TBS 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 traveled at least once at any time point during the study