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Table 2 Time for mortality to drop below 80% and 50% for laboratory, simple hut, and experimental hut bioassays

From: Experimental hut and bioassay evaluation of the residual activity of a polymer-enhanced suspension concentrate (SC-PE) formulation of deltamethrin for IRS use in the control of Anopheles arabiensis

Substrate

Insecticide

Estimated time to 80% mortality

Estimated time to 50% mortality

Time (months)

95% CI

Time (months)

95% CI

Laboratory bioassays

Mud

Delta SC-PE 50

13.4

(12.8 to 14.3)

15.8

(15.0 to 17.1)

Delta SC-PE 25

8.3

(7.5 to 9.1)

11.6

(10.9 to 12.4)

Delta WG 25

8.1

(7.6 to 8.7)

10.9

(10.4 to 11.4)

DDT WP 2000

5.2

(4.4 to 5.9)

8.4

(7.8 to 9.0)

Concrete

Delta SC-PE 50

†

†

†

†

Delta SC-PE 25

15.5

(14.5 to 17.3)

†

†

Delta WG 25

14.9

(13.8 to 16.9)

†

†

DDT WP 2000

10.1

(8.9 to 11.4)

14.6

(13.3 to 16.6)

Simple hut bioassays

Mud

Delta SC-PE 50

†

†

4.6

(2.4 to 6.0)

 

Delta SC-PE 25

†

†

6.0

(5.0 to 6.9)

 

Delta WG 25

†

†

2.6

(0.3 to 4.1)

Concrete

Delta SC-PE 50

11.2

(10.4 to 12.1)

14.7

(13.7 to 16.0)

 

Delta SC-PE 25

8.0

(6.7 to 9.0)

12.4

(11.3 to 13.9)

 

Delta WG 25

†

†

2.1

(†to 3.6)

Experimental hut bioassays

Mud

Delta SC-PE 25

2.8

(0.2 to 4.6)

8.0

(6.7 to 9.2)

 

Delta WG 25

†

†

0.5

(†to 3.0)

 

DDT WP 2000

†

†

3.3

(1.1 to 5.0)

Concrete

Delta SC-PE 25

11.4

(9.2 to 16.7)

†

†

 

Delta WG 25

5.8

(0.8 to 8.2)

†

†

 

DDT WP 2000

7.0

(4.3 to 8.9)

12.0

(10.4 to 15.1)

  1. Notes : † indicates that statistical models produced estimates outside the study period.