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) |