Convergence of energies

Hi, energies of materials on MP are typically reported to the fourth decimal place. For example NaCl: -3.3881 eV. (found here:

Does this mean a numerical precision of -3.3881 ± 0.0001 eV/atom ?

My doubts come from the Materials Project Documentation (

In the “Total energy convergence” chapter it says that “96% of compounds tested were converged to within 15 meV / atom.”

Does this mean that I have to assume for every energy reported on MP a worst-case numerical precision of 15 meV?

In the case of NaCl this would give -3.38 ± 0.015 eV/atom ?