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Table 4 Variance component analysis of differences between countries, LLIN brands and survey periods in factors contributing to durability

From: Attrition, physical integrity and insecticidal activity of long-lasting insecticidal nets in sub-Saharan Africa and modelling of their impact on vectorial capacity

  Source of variation
Country LLIN brand Time period Country: time period interaction LLIN brand: time period interaction
Survival of LLINsa
 σ2 1.1 (0*–3.2) 0.2 (0*–0.6) 2.8 (0*–6.7) 2.2 (0.6–3.8) 0.4 (0*–0.8)
 %Total 14.6 3.2 36.0 27.9 5.2
Use of extant LLINsa
 σ2 15.6 (0*–35.8) 3.6 (0*–8.3) 0.5 (0*–2.4) 1.4 (0*–4.2) 0.0 (0*–0.0)
 %Total 47.3 10.8 1.4 4.3 0*
Original cohort LLINs in usea
 σ2 10.7 (0*–25.2) 3.2 (0*–7.4) 6.6 (0*–15.2) 2.0 (0*–5.1) 0* (0.0–0.0)
 %Total 33.0 9.8 20.3 6.2 0*
Mean of Logarithm of holed area
 σ2 0.7 (0*–1.6) 0.4 (0*–0.9) 1.7 (0*–3.6) 0.0 (0*–0.1) 0.0 (0*–0.1)
 %Total 21.5 12.3 52.6 1.1 1
  1. σ2: Estimate of variance component (95% confidence intervals); %Total is the percentage of the total variance in the outcome
  2. *The REML algorithm constrains the estimates of variance components to be positive. Values of zero are substituted where the algorithm did not converge on a positive value
  3. aProportions analysed on a logit scale