1\begin{tabular}{lccc}2\toprule3Test & $\chi^2$ & df & $p$ \\4\midrule5H1: nonlinear age terms = 0 (A2) & 340.1 & 6 & 2.01e-70 \\6H1: nonlinear mileage terms = 0 (A2) & 412.8 & 6 & 5.06e-86 \\7H1: all nonlinear terms = 0 (A2) & 663.6 & 12 & 2.73e-134 \\8H1: age $\times$ mileage tensor = 0 (A2t) & 661.2 & 49 & 3.69e-108 \\9H1: age profile $\times$ powertrain = 0 (A3) & 312.1 & 35 & 3.37e-46 \\10H4: region effects = 0 (A4) & 14.9 & 16 & 0.534 \\11\bottomrule12\end{tabular}13