Averaging over neutrino species, the invisible ${{\mathit Z}}$ decay width determines the effective neutrino coupling $\mathit g{}^{{{\mathit \nu}_{{{{{\mathit \ell}}}}}}}$. For $\mathit g{}^{{{\mathit \nu}_{{{e}}}}}$ and $\mathit g{}^{{{\mathit \nu}_{{{\mu}}}}}$, ${{\mathit \nu}_{{{e}}}}{{\mathit e}}$ and ${{\mathit \nu}_{{{\mu}}}}{{\mathit e}}$ scattering results are combined with $\mathit g{}^{{{\mathit e}}}_{\mathit A}$ and $\mathit g{}^{{{\mathit e}}}_{\mathit V}$ measurements at the ${{\mathit Z}}$ mass to obtain $\mathit g{}^{{{\mathit \nu}_{{{e}}}}}$ and $\mathit g{}^{{{\mathit \nu}_{{{\mu}}}}}$ following NOVIKOV 1993C.