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Table 3 Proportion of long-lasting insecticide nets with holes, mean number of holes by location, and proportional hole index over time in Ethiopia

From: Bed nets used to protect against malaria do not last long in a semi-arid area of Ethiopia: a cohort study

Characteristic

6 months

N = 833

12 months

N = 410

18 months

N = 159

24 months

N = 39

Holes (size categories 1–4), n (%)

298 (35.8)

204 (49.8)

107 (67.3)

31 (79.5)

Mean (SD) number of holes

 Lower half segment of nets

3.7 (12.7)

4.2 (12.0)

5.7 (13.3)

4.4 (6.6)

 Upper half segment of nets

2.1 (8.1)

2.2 (4.6)

3.7 (8.1)

5 (9.2)

 Roof segment of nets

1.2 (4.9)

1.8 (4.6)

2.6 (4.5)

3.3 (3.8)

GM pHI (95% CI)a

216 (167–279)

251 (195–323)

316 (234–427)

211 (117–378)

Median pHI (IQR)a

270 (48–993)

275 (88–843)

422 (173–775)

296 (77–604)

  1. N: The total number of LLINs available for evaluation at each data collection period
  2. CI Confidence interval, IQR interquartile range, LLIN long-lasting insecticidal net, SD standard deviation, GM geometric mean, pHI proportional hole index
  3. a Number of LLINs evaluated (n = 274 at 6 months, n = 170 at 12 months, n = 85 at 18 months, and n = 28 at 24 months)