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Table 5 Number and proportion of Olyset nets of different physical condition with recommended permethrin content and passed WHO cone/tunnel assay tests criteria

From: Durability of Olyset campaign nets distributed between 2009 and 2011 in eight districts of Tanzania

Explanatory variables Net physical condition (pHI)
Good (pHI <64) ( %) Damaged (pHI = 64–642) ( %) Serviceable condition** (pHI <643) ( %) Unserviceable condition (pHI >642) ( %)
Number of subsampled nets 73 (37) 47 (24) 120 (61) 78 (39)
Cone assays
 Proportion of nets passed WHO cone assay criteriaa 79 (n = 58) 60 (n = 28) 72 (n = 86) 51 (n = 40)
Cone assays or tunnel testsb
 Proportion of nets passed WHO cone or tunnel tests criteria 97 (n = 71) 96 (n = 45) 97 (n = 116) 100 (n = 78)
Chemical residue
 Proportion of nets with recommended permethrin content 92 (n = 67) 81 (n = 38) 88 (n = 105) 64 (n = 50)
 Mean permethrin content in g/kg (95 % CI) 17.8 (17.4–18.2) 16.5 (15.8–17.2) 17.3 (16.9–17.7) 15.4 (14.7–16.0)
  1. ** Serviceable condition include nets in good condition and those in damaged condition
  2. a WHO cone assay criteria: ≥95 % knockdown and/or ≥80 % mortality pass criteria
  3. b WHO tunnel test criteria: ≥80 % mortality and/or ≥90 % blood feeding inhibition pass criteria