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Table 1 LLIN durability components

From: Investigating mosquito net durability for malaria control in Tanzania - attrition, bioefficacy, chemistry, degradation and insecticide resistance (ABCDR): study protocol

Component

Definition

Response variables for analysis

Attrition

Net loss from household through discarding or use for alternative purpose

- Net presence.

Biological efficacy

Ability of net to incapacitate or kill anopheline mosquitoes after contact with insecticide

- Mosquito knockdown (%) 60 minutes post-exposure.

- Mosquito mortality (%) 24 hours post-exposure.

- Percentage of bloodfed mosquitoes.

Chemical residue

Amount of active ingredient in fibres

- Proportion of nets with active ingredient equal to WHO standard g/kg

Physical degradation

Physical state of the net defined through number, size and location of holes to estimate protection against mosquito bites

- Proportionate Hole Index (pHI) / hole area by location on net.

- Proportion of nets with a pHI exceeding ≥643 [6].