  This note presents a combination of published and preliminary electroweak
results from the four LEP collaborations and the SLD collaboration which were
prepared for the 2004 summer conferences. [...] The main changes with respect
to the experimental results presented in summer 2003 are updates to the W
branching fractions and four-fermion cross sections measured at LEP-2, and the
SLD/LEP heavy-flavour results measured at the Z pole. The results are compared
with precise electroweak measurements from other experiments, notably the final
result on the electroweak mixing angle determined in neutrino-nucleon
scattering by the NuTeV collaboration, the latest result in atomic parity
violation in Caesium, and the measurement of the electroweak mixing angle in
Moller scattering. The parameters of the Standard Model are evaluated, first
using the combined LEP electroweak measurements, and then using the full set of
high-$Q^2$ electroweak results.
