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Table 1 Descriptive statistics of the study participants

From: Antibody responses to merozoite antigens after natural Plasmodium falciparum infection: kinetics and longevity in absence of re-exposure

  Previously naïve Previously exposed
Number of participants 20 41
Female sex (%) 3 (15.0) 7 (17.1)
Median age, years (range) 34 (21–59) 40 (27–70)
Median cumulative time of residency in an endemic area, years (range) 0 (0–3) 25 (13–39)
Median time since residency in an endemic area, years (range) 14 (0–46)
Median time from symptom onset to diagnosis, days (range) 3 (0–12) 3 (1–13)
Median parasitaemia, % infected RBCs (range) 0.9 (< 0.1–8.0) 0.3 (< 0.1–17)
Late treatment failure* (%) 5 (25) 0 (0)
Severe malaria (%) 1 (5) 4 (9.7)
Treated in intensive care unit (%) 1 (5) 2 (4.9)
Initial intraveneous artesunate treatment (%) 6 (30) 10 (24.4)
  1. *Presented with recrudescent parasitaemia and fever 20–28 days following initial treatment
  2. Severe malaria was defined according to the WHO classification