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Calabi and Cheng-Yau's Bernstein-type theorem asserts that an entire zeromean curvature graph in Lorentz-Minkowski $(n+1)$-space $\boldsymbol R^{n+1}_1$which admits only space-like points is a hyperplane. Recently, the third andfourth authors proved a line theorem for hypersurfaces at their degeneratelight-like points. Using this, we give an improvement of the Bernstein-typetheorem, and we show that an entire zero mean curvature graph in $\boldsymbolR^{n+1}_1$ consisting only of space-like or light-like points is a hyperplane.This is a generalization of the first, third and fourth authors' previousresult for $n=2$.

Bernstein-type theorem for zero mean curvature hypersurfaces without time-like points in Lorentz-Minkowski space