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

Reference categories: 1 Time of day  =  PM, 2 Operation  =  Running, 3 Distance band  =  Near, 4 Operation  =  Braked.
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).