For the specification of the cross sections of the fissile isotopes in the neu-tron energy region of unresolved resonances, the single-level formalism is often used, while an analysis of the cross sections in the resolved region indicates that a multilevel formula may be more appropriate. In this paper, we compare the statistical properties of the cross sections generated using the single-level formalism with those obtained by a multilevel formulation. The multilevel parameters were chosen to give the same average cross sections as the single-level formalism. The comparison indicates that there are small, but significant, differences between the statistical properties of the cross sections obtained with the multilevel formalism and those obtained with the single-level formula. The differences are probably too small, particularly when Doppler broadening is considered, to affect reactor calculations.