Fig. 4
From: Evaluation of the durability of long‐lasting insecticidal nets in Guatemala
Estimated total deltamethrin concentration (mg/m2) measured by X-ray fluorescence (XRF) at the survey time-points. The time-point of 0 represents values on unused long-lasting insecticidal nets (LLINs) that were from the same batch as those distributed. The dashed horizontal line represents the threshold of 25 mg/m2 and the solid horizontal line represents the threshold of 10 mg/m2