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Table 4 Proportion of long-lasting insecticide nets in good, acceptable, or torn condition over time, as defined by the proportional hole index in Ethiopia

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

Category defined by pHI

6 months

N = 833

n (%)

12 months

N = 410

n (%)

18 months

N = 159

n (%)

24 months

N = 39

n (%)

Good (0–64)

610 (73.2)

243 (59.3)

63 (39.6)

14 (35.9)

Acceptable (65–642)

100 (12.0)

82 (9.8)

45 (28.3)

16 (41.0)

Torn (> 643)

123 (14.8)

85 (20.7)

51 (32.1)

9 (23.1)

LLINs present at all follow-up visits, n = 39

 Good (0–64)

34 (87.2)

29 (74.4)

19 (48.7)

14 (35.9)

 Acceptable (65–642)

4 (10.3)

6 (15.4)

13 (33.3)

16 (41.0)

 Torn (> 643)

1 (2.6)

4 (10.3)

7 (17.9)

9 (23.1)

  1. N: The total number of LLINs available for evaluation at each data collection period
  2. LLIN long-lasting insecticidal net, pHI proportional hole index