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Table 2 Seasonal changes of different surveillance methods

From: Active case surveillance, passive case surveillance and asymptomatic malaria parasite screening illustrate different age distribution, spatial clustering and seasonality in western Kenya

Surveillance method Early season Peak season Late season
ACS (cases/1,000 population/year) 18.9 a 108.4 b 16.0 a
PCS (cases/1,000 population/year) 11.8 a 51.8 b 8.4 c
APS (prevalence rate %) 7.3 a 9.0 b na
  1. Same (different) letters following the numbers in the same row indicate insignificant (significant) difference tested by χ 2-test at 5% level. na = not available.