Parameter estimates and likelihood ratio tests of the GLMM for the activity (number of flights per hour) of all bird species combined.

<p>Reference categories: ¹ Time of day = PM, ² Operation = Running, ³ Distance band = Near, ⁴ Operation = Braked.</p><p>The 95% confidence interval represents the quantiles of N = 5000 simulated draws from the estimated parameter distributions. ΔAIC, ΔLog Likelihood, and χ² are likelihood ratio tests of the deletion of each term from the full model (for the 3-way interaction), from the model including two-way interactions only (two-way interaction term) and from the model with main effects only (main effect terms).