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Table 1 Demographic characteristics for persons sampled in Asembo by year (% [n])

From: Serological markers for monitoring historical changes in malaria transmission intensity in a highly endemic region of Western Kenya, 1994–2009

   1994 2000 2007 2008 2009
   (n = 636) (n = 629) (n = 169) (n = 173) (n = 1,038)
Age (in years) 1 to 5 63.4 (403) 100 (629) 42.0 (71) 39.3 (68) 24.8 (257)
  6 to 15 17.6 (112) 0 (0) 58.0 (98) 60.7 (105) 29.2 (303)
  16 to 90 19.0 (121) 0 (0) 0 (0) 0 (0) 46.0 (478)
Sex Female 64.3 (409) 54.1 (340) 49.4 (80) 42.1 (67) 56.9 (590)
  Male 35.7 (227) 45.9 (289) 50.6 (82) 57.9 (92) 43.1 (446)
  Not recorded 0 0 7 14 2
Blood film resulta Positive 80.5 (418) 54.2 (341) 36.0 (59) 42.9 (72) 36.3 (377)
  Negative 19.5 (101) 45.8 (288) 64.0 (105) 57.1 (96) 63.7 (661)
  Not recorded 117 0 5 5 0
Year village 1997b 47.2 (300) 47.2 (297) 42.1 (69) 43.6 (75) 48.1 (498)
received ITNs 1999c 52.8 (336) 52.8 (332) 57.9 (95) 56.4 (97) 51.9 (538)
  Not recorded 0 0 5 1 2
Source of samples   Asembo Bay Cohort Projectd,e ITN follow-up studyf KEMRI/CDC parasitaemia and anaemia surveyg KEMRI/CDC parasitaemia and anaemia surveyg KEMRI/CDC parasitaemia and anaemia surveyg
Survey months   April to June May to June April April March to April
  1. aAsexual P. falciparum parasites detected by microscopy.
  2. bAt the time of the survey, resided in a village that received ITNs at start of trial in 1997.
  3. cAt the time of the survey, resided in a village that received ITNs at end of trial in 1999.
  4. dBloland et al.[27].
  5. eBloland et al.[36].
  6. fLindblade et al.[30].
  7. gHamel et al.[31].