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Table 1 Insecticide levels of total sample of collected nets, by site and collection time

From: Estimation of insecticide persistence, biological activity and mosquito resistance to PermaNet® 2 long-lasting insecticidal nets over three to 32 months of use in Ethiopia

Site

 

No of nets (no tested in bio-assay)

Deltamethrin concentration (mg/m2) (by XRF) Mean (SD)

No (%) of nets with <10 mg/m2deltamethrin

Manufacturer’s reported batch mean deltamethrin concentration (MRBMC) (mg/m2)

Difference between field XRF and MRBMC (%)

A

 

25 (4)

64.7 (13.3)

0

59.9

8.0

B

 

25 (4)

67.6 (10.8)

0

59.9

12.9

C

 

25 (4)

69.7 (14.3)

0

59.7

16.8

D

 

25 (4)

74.8 (12.5)

0

59.7

25.3

E

 

25 (4)

58.0 (14.3)

0

60.0

-3.3

F

 

25 (4)

58.1 (20.0)

1 (4)

60.0

-3.2

G

 

5 (0)

76.9 (5.6)

0

58.9

30.6

H

 

14 (0)

72.9 (9.5)

0

58.9

23.8

J

 

20 (4)

63.8 (8.6)

0

60.9

4.8

 

3–6 months

189 (28)

66.2 (14.6)

1 (0.5)

59.8*

10.8

K

 

20 (4)

53.2 (15.9)

0

59.9

-11.2

L

 

20 (4)

38.1 (19.9)

1 (5)

59.1

-35.5

M

 

20 (4)

58.5 (14.7)

0

59.1

-1.0

N

 

20 (4)

41.6 (19.3)

1 (5)

59.7

-30.3

P

 

20 (4)

46.9 (19.9)

0

57.7

-18.7

Q

 

20 (4)

48.1 (19.0)

0

59.1

-18.6

R

 

20 (4)

30.7 (26.8)

6 (30)

60.0

-48.8

S

 

20 (4)

50.4 (26.0)

1 (5)

61.0

-17.4

T

 

20 (4)

47.1 (18.0)

0

58.9

-20.0

U

 

20 (4)

41.6 (19.3)

1 (5)

59.1

-29.6

J

 

20 (4)

28.7 (14.5)

2 (10)

60.9

-52.9

 

14-20 months

220 (44)

44.1 (21.2)

12 (5.5)

59.5*

-25.9

K

 

20 (4)

40.0 (19.3)

2 (10)

59.9

-33.2

L

 

20 (4)

46.6 (13.9)

0

59.1

-21.2

M

 

20 (4)

54.3 (21.1)

0

59.1

-8.1

N

 

20 (4)

34.1 (14.7)

0

59.7

-42.9

P

 

20 (4)

35.5 (16.6)

1 (5)

57.7

-38.5

Q

 

20 (4)

42.0 (18.7)

0

59.1

-28.9

R

 

20 (4)

32.5 (18.0)

4 (20)

60.0

-45.8

S

 

20 (4)

45.3 (20.7)

0

61.0

-25.7

T

 

20 (4)

38.0 (14.0)

0

58.9

-35.5

U

 

20 (4)

42.4 (23.2)

1 (5)

59.1

-28.3

 

26-32 months

200 (40)

41.1 (18.9)

8 (4.0)

59.4*

-30.8

  1. *Average of the sites in the time group of collection.