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Table 5 Estimated time (months) for mortality to decrease to 80 and 50% for Anopheles arabiensis dondotha (pyrethroid susceptible), tested on sprayed experimental hut walls (concrete and mud) and ceiling (thatch)

From: Long-lasting control of Anopheles arabiensis by a single spray application of micro-encapsulated pirimiphos-methyl (Actellic® 300 CS)

Insecticide

Substrate

Estimated time to 80% mortality

Estimated time to 50% mortality

Time (months)

95% CI

Time (months)

95% CI

Hut walls

P-methyl EC

Mud

P-methyl CS B

Concrete

7.0

(5.4 to 8.3)

11.3

(10.2 to 12.4)

Mud

4.8

(1.9 to 6.9)

11.4

(9.9 to 13.0)

P-methyl CS BM

Concrete

6.6

(3.0 to 9.0)

16.0

(13.5 to 20.6)

Mud

0.9

(† to 4.4)

9.0

(6.4 to 11.0)

Hut ceilings

P-methyl EC

Thatch

2.4

(† to 6.1)

P-methyl CS B

Thatch

8.4

(7.4 to 9.4)

12.0

(11.2 to 12.7)

P-methyl CS BM

Thatch

10.8

(9.9 to 11.7)

14.4

(13.7 to 15.2)

  1. †Indicates that statistical models produced estimates outside the study period: in all cases estimates were lower than the specified mortality (50 or 80%, respectively) throughout the entire study period.