An estimate of the chiral condensate from unquenched lattice QCD

Using the parameters in the chiral Lagrangian obtained by MILC from their unquenched lattice QCD calculations with 2+1 flavours of sea quarks, I estimate the chiral condensate. I obtain the result ψψ(2 GeV)/n f = −(259 ± 27 MeV) 3 in the M S scheme. I compare this value to other determinations.