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Table 2 Malaria prevalence in fever cases and controls and the fractions of malaria-attributable fevers by age group. Health facilities surveys. Na = not applicable (when the OR = 0 this value cannot be calculated using the standard formula).

From: Rapid Urban Malaria Appraisal (RUMA) IV: Epidemiology of urban malaria in Cotonou (Benin)

Age group Fever cases Controls OR 95% CI Fractions of malaria attributable fevers
Infants 0–1 year 0/63 (0%) 2/140 (1.4%) 0.00 0.00–9.16 Na
Children 1–5 years 5/68 (6.8%) 4/137 (2.8%) 2.64 0.59–12.19 0.04
Children 6–15 years 0/35 (0%) 1/78 (1.3%) 0.00 0.00–40.03 na
Adults >15 years 2/213 (0.9%) 11/529 (2.0%) 0.45 0.10–2.05 -0.01¥
  1. ¥ Since the OR<1, the fraction of malaria attributable fevers is <0, suggesting that the true rate of malaria fevers is zero.
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