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. 2013 Jan 22;12:27. doi: 10.1186/1475-2875-12-27

Table 1.

Demographic characteristics, malaria parasite prevalence (by microscopy and PCR), and proportion of symptomatic malaria infections in the study population by year (2000 vs 2009–2012) and season

Rainy seasons October 2000 October 2009 October 2010 October 2011
Number of participants
 1561
 402
 256
 219
Median age (IQR) [years]
 14 (6–30)
 11 (5–28)
 15 (9–37)
 13 (6–33)
Age range [years]
 0-90
 1-89
 1-90
 1-74
Proportion of male participants [%]
 50.5
 46.5
 53.1
 48.4
Parasite prevalence microscopy [%] (CI95%)
 78.9 (76.8-80.9)
 58.4 (53.4-63.2)
 55.90 (49.5-62.0)
 49.3 (42.5-56.1)
Parasite prevalence PCR [%] (CI 95%)
 92.0 (87.4-95.4)*
 66.1 (61.1-70.7)1
 68.8 (62.7-74.4)1
 73.7 (67–79.7)2
Number of symptomatic patients [%]**
  
 14.7
 9.8
 15.1
Dry seasons
  
 April 2010
 April 2011
 April 2012
Number of participants
  
 362
 267
 261
Median age (IQR) [years]
  
 14 (5–34)
 15 (7–33)
 13 (7–37)
Age range [years]
  
 1-78
 0-77
 1-78
Proportion of male participants [%]
  
 44.8
 44.9
 45.6
Parasite prevalence microscopy [%] (CI95%)
  
 30.1 (25.4-35.1)
 29.6 (24.1-35.5)
 32.6 (26.9-38.6)
Parasite prevalence PCR [%] (CI95%)
  
 39.4 (33.6-45.4)1
 39.3 (33.4-45.5)1
 34.6 (28.8-40.7) 2
Number of symptomatic patients [%]**
  
 4.6
 1.3
 3.8
Combined estimates
 Combined rainy seasons 2009-2011
 Combined data dry seasons 2010-2012
  
  
Number of participants
 877
 890
  
  
Median age (IQR) [years]
 13 (6–31)
 14 (6–35)
  
  
Age range [years]
 0-90
 0-78
  
  
Proportion of male participants [%]
 48.9
 45.0
  
  
Parasite prevalence microscopy [%] (CI95%)
 55.4 (51.9-58.6)
 30.7 (27.5-33.7)
  
  
Parasite prevalence PCR [%] (CI95%)
 68.7 (65.4-71.8)
 37.9 (34.7-41.2)
  
  
Number of symptomatic patients [%]** 13.2 3.2    

*Species analysis performed for subset of 201 patients.

**defined as microscopy positive and body temperature >37.5°C.

1by species-specific PCR.

2by drug resistance genotyping PCR.