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Table 2 The number of clinical malaria cases, child-years of follow up and clinical incidence rates by focal area

From: Fine-scale spatial and temporal variation of clinical malaria incidence and associated factors in children in rural Malawi: a longitudinal study

  Focal area A (N = 106) Focal area B (N = 96) Focal area C (N = 80) Total
Total clinical malaria cases 72 179 58 309
Total follow up child-years 103.3 88.8 75.7 267.8
Total child-years at riska 100.5 81.9 73.5 255.9
Clinical malaria incidence rate: per child-years at risk 0.7 2.2 0.8 1.2
Children with at least one clinical malaria case: n (%) 44 (41.5) 75 (78.1) 42 (52.5) 161 (57.1)
 One clinical malaria case: n (%) 26 (24.5) 23 (24.0) 29 (36.3) 78 (27.7)
 2–3 clinical malaria cases: n (%) 16 (15.1) 36 (37.5) 13 (16.3) 65 (23.1)
 4 or more clinical malaria cases: n (%) 2 (1.9) 16 (16.7) 0 18 (6.4)
  1. aCalculated from subtracting 14 days from total child-years for each malaria case; child-years at risk also includes the period of follow-up of children who did not complete 12 months