Error estimates for pi pi scattering threshold parameters in chiral perturbation theory to two loops

Using the analysis of ChPT to two loops, we perform an error analysis of th e threshold and low-energy parameters, based on the uncertainties for the o ne-loop low-energy parameters and the resonance saturation mechanism. Diffe rent sets of one-loop low-energy constants have been considered. Thus, the predictive power of the effective field theory, is quantified on the basis of the present experimental uncertainties.