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Table 1 Descriptive statistics of parasite and leukocyte counts on TBSs

From: Evidence for overdispersion in the distribution of malaria parasites and leukocytes in thick blood smears

TBS

a

b

c

Number of HPFs

754

938

836

Volume of blood∗ (μ l)

1.51

1.88

1.67

PD ‡ (parasites/ μ l)

16,190.79

31,783.18

3,725.95

Parasites and

p a

ℓ a

p b

ℓ b

p c

ℓ c

leukocytes

      

Total number

20621

10189

38112

9593

5989

12859

Mean (per HPF)

27.35

13.51

40.63

10.23

7.16

15.38

Median

25

13

37

10

7

14

Range

0-111

0-43

0-131

0-35

0-22

2-47

IQR †

12-40

8-17

20-60

6-14

4-10

11-19

Standard deviation

18.76

7.22

25.94

5.90

3.92

6.62

% negative §

1.06

1.06

0.75

1.39

1.08

0.00

  1. Three thick blood smears are studied “a ”, “ b ”, “ c ”.
  2. Parasite and leukocyte counts for each TBS are denoted (p a , ℓ a ), ( p b , ℓ b ) et ( p c , ℓ c ).
  3. *Assuming that the volume of blood in one HPF is approximately 0.002 μ l [[19, 46, 47].
  4. ‡PD = p ℓ × 8,000, assuming that the number of leukocytes per microlitre of blood is 8,000 [[7, 48, 49].
  5. †Inter-Quartile Range.
  6. §Percentage of negative high-power fields (HPFs) where no parasites and/or no leukocytes are seen.
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Malaria Journal

ISSN: 1475-2875

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