  Recently, the tetraquark mixing framework has been proposed as a possible
structure for the two light-meson nonets in the $J^P=0^+$ channel, the light
nonet composed of $a_0(980)$, $K_0^*(700)$, $f_0(500)$, $f_0(980)$, and the
heavy nonet of $a_0(1450)$, $K_0^*(1430)$, $f_0(1370)$, $f_0(1500)$. Among
various signatures, we report in this work that their partial decay widths
collected from various experimental data in Particle Data Group (PDG) can
support this mixing scheme also. In particular, we demonstrate that the
couplings of the light nonet to two pseudoscalar mesons estimated from the
partial widths are consistently stronger than those of the heavy nonet. This
consistent feature agrees qualitatively well with the predictions from the
tetraquark mixing framework and, therefore, provides supporting evidence for
the tetraquark mixing.
