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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.