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Table 3 Decomposition of effects from mediation analysis for the effects of temperature on NliceA_std that are direct or mediated through IP, taking into account interaction between T and IP

From: Parasitic sea louse infestations on wild sea trout: separating the roles of fish farms and temperature

Effect Estimate SE Interpretation
Pure direct effect 0.007 0.060 The increase in log(NliceA) brought about by a 1 SD increase in T with IP held constant at an average T
Total direct effect 0.156 0.051** The increase in log(NliceA) brought about by a 1 SD increase in T with IP held constant at the level resulting from that 1 SD increase in T
Pure indirect effect 0.418 0.047*** The increase in log(NliceA) brought about by increasing IP by the amount that would result from a 1 SD increase in T while holding T constant at an average T
Total indirect effect 0.567 0.073*** The increase in log(NliceA) brought about by increasing IP by an amount that would result from 1 SD increase in T while holding T constant at the level resulting from that 1 SD increase in T
% of total effect mediated 0.784   Based on a total effect of 0.723
  1. *P < 0.05, **P < 0.01, ***P < 0.001
  2. Abbreviations: IP, infestation pressure from fish farms; SE, standard error; SD, standard deviation; T, temperature