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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

From: Declining malaria parasite prevalence and trends of asymptomatic parasitaemia in a seasonal transmission setting in north-western Burkina Faso between 2000 and 2009–2012

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   
  1. *Species analysis performed for subset of 201 patients.
  2. **defined as microscopy positive and body temperature >37.5°C.
  3. 1by species-specific PCR.
  4. 2by drug resistance genotyping PCR.