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Abstract Recently, the tetraquark mixing framework has been proposed as a possible structure for the two light-meson nonets in the $$J^P=0^+$$ J P = 0 + channel, the light nonet composed of $$a_0(980)$$ a 0 ( 980 ) , $$K_0^*(700)$$ K 0 ∗ ( 700 ) , $$f_0(500)$$ f 0 ( 500 ) , $$f_0(980)$$ f 0 ( 980 ) , and the heavy nonet of $$a_0(1450)$$ a 0 ( 1450 ) , $$K_0^*(1430)$$ K 0 ∗ ( 1430 ) , $$f_0(1370)$$ f 0 ( 1370 ) , $$f_0(1500)$$ 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.