Table 3 Comparison of geometric means (GM) of proportionate hole index (pHI) of LLINs at different ages
From: A longitudinal study of the durability of long-lasting insecticidal nets in Zambia
All LLINs in the study | 12 months | 18 months | 24 months | 30 months |
|---|---|---|---|---|
n = 999 | n = 721 | n = 520 | n = 325 | |
Any holes n (%) | 692 (69.3) | 551 (76.4) | 448 (86.2) | 290 (89.2) |
GM pHI (95 % confidence interval [CI]) | 15.5 (13.1–18.4) | 33.8 (27.3–41.6) | 77.8 (61.9–97.9) | 102.8 (77.5–136.3) |
GM pHI Permanets® (95 % CI) n = 499 | 12.6 (9.8–16.0) | 30.0 (22.3–40.2) | 91.3 (67.4–123.5) | 93.6 (64.0–136.6) |
GM pHI Olysets® (95 % CI) n = 500 | 19.1 (15.0–24.4) | 37.7 (27.9–50.8) | 66.5 (47.1–93.7) | 115.0 (75.3–175.5) |
Only LLINs present at all follow-up visits, n = 274 | ||||
Any holes n (%) | 165 (60.2) | 196 (71.5) | 239 (87.2) | 271 (91.6) |
GM pHI (95 % CI) | 6.7 (4.8–9.3) | 20.5 (14.6–28.5) | 65.3 (48.2–88.5) | 122.7 (91.1–165.3) |
GM pHI Permanets® (95 % CI) n = 137 | 6.3 (3.9–9.9) | 22.1 (13.9–35.0) | 73.6 (49.1–109.9) | 124.4 (82.2–188.1) |
GM pHI Olysets® (95 % CI) n = 137 | 7.2 (4.5–11.2) | 19.0 (11.7–30.5) | 58.0 (36.7–91.3) | 121.0 (78.7–185.7) |