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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.