highly significantP = 2.3e -5
We employed standard ANOVA F-tests [ 59 ] to evaluate the significance of the interaction term (reflecting varying slope by treatment group) and found that the evidence did not support inclusion of the interaction term (P = 0.93) when comparing these two models, but when comparing the simpler model to the trivial model that ignores treatment group (adjusted R 2 = 0.75), the ANOVA F-test P-value is highly significant (P = 2.3e -5 ), supporting the inclusion of group-specific intercepts, but not group-specific slopes, in the final model.