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Table 6 Progression of hole formation and proportionate Hole Index (pHI) values for Olyset® Plus and Olyset® Net

From: Bioefficacy and durability of Olyset® Plus, a permethrin and piperonyl butoxide-treated insecticidal net in a 3-year long trial in Kenya

Net brand

Follow up months

No. of nets sampled

Number of nets with any size holes (%; 95% CI)

No. of nets by pHI values

(%; 95% CI)

pHI < 65 (in good condition)

pHI 65–642

(in acceptable condition)

pHI > 642

(too torn nets)

Olyset® Plus

6

250

115

(46.0; 39.9–52.1)

219

(87.6; 82.9–91.1)

19

(7.6; 4.9–11.5)

12

(4.8; 2.8–8.2)

 

12

243

131

(54.0; 47.6–60.1)

190

(78.2; 72.6–82.9)

30

(12.4; 8.8–17.0)

23

(9.5; 6.3–13.8)

 

24

231

120

(52.0; 45.5–58.3)

145

(62.8; 56.7–68.7)

58

(25.1; 19.9–31.1)

28

(12.0; 8.5–16.9)

 

36

228

144

(63.0; 56.7–69.1)

113

(49.6; 43.1–56.0)

62

(27.1; 21.8–33.3)

53

(23.2; 18.2–29.2)

Olyset® Net

6

250

157

(63.0; 56.7–68.6)

186

(74.4; 68.7–79.4)

57

(22.8; 18.1–28.4)

7

(2.8; 1.3–5.7)

 

12

249

169

(68.0; 61.8–73.4)

159

(63.9; 57.7–69.6)

76

(30.5; 25.1–36.5)

14

(5.6; 3.4–9.2)

 

24

226

147

(65.0; 58.6–70.9)

120

(53.1; 46.6–59.5)

71

(31.4; 25.7–37.7)

35

(15.5; 11.4–20.8)

 

36

216

156

(72.0; 65.9–77.9)

97

(44.9; 38.4–51.6)

71

(32.8; 26.9–39.4)

48

(22.2; 17.2–28.2)