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Table 4 Proportion of LLINs in good, damaged, or too torn conditions at different ages, as defined by proportionate hole index (pHI)

From: A longitudinal study of the durability of long-lasting insecticidal nets in Zambia

Category as defined by pHI 12 months n (%)a 18 months n (%) 24 months n (%) 30 months n (%)
All nets n = 999 n = 721 n = 520 n = 325
Good (0–64) 656 (65.7) 381 (52.8) 200 (38.5) 117 (36.0)
Damaged (65–642) 247 (24.7) 205 (28.4) 188 (36.2) 112 (34.5)
Too torn (>643) 96 (9.6) 135 (18.7) 132 (25.4) 96 (29.5)
LLINs present at all follow-up visits, n = 274a
 Good (0–64) 209 (76.3) 163 (59.5) 113 (41.2) 89 (32.5)
 Damaged (65–642) 55 (20.1) 79 (28.8) 106 (38.7) 99 (36.1)
 Too torn (>643) 10 (3.7) 32 (11.7) 55 (20.1) 86 (31.4)
  1. aNo significant differences between Permanets® and Olysets®