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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)