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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.