The CPT-violation parameters Re(δ) and Im(δ) determined recently by CPLEAR are used to evaluate the K⁰– mass and decay-width differences, as given by the difference between the diagonal elements of the neutral-kaon mixing matrix (M−iΓ/2). The results – GeV and GeV – are consistent with CPT invariance. The CPT invariance is also shown to hold within a few times 10⁻³–10⁻⁴ for many of the amplitudes describing neutral-kaon decays to different final states.