  We prove that if two Tambara-Yamagami categories TY(A,\chi,\nu) and
TY(A',\chi',\nu') give rise to the same state sum invariants of 3-manifolds and
the order of one of the groups A, A' is odd, then \nu=\nu' and there is a group
isomorphism A\approx A' carrying \chi to \chi'. The proof is based on an
explicit computation of the state sum invariants for the lens spaces of type
(k,1).
