Comparison of relative SN type ratios from the literature sample as a function of metallicity, inferred from both global galaxy properties – M_g^host (magenta stars) and M_* (cyan circles) – and local galaxy properties – N2 (green crosses) and O3N2 (as gold x). The ratio configuration for each case is indicated in the top right of the corresponding panel. Vertical dashed black lines mark the metallicities of the Small Magellanic Cloud (SMC), the Large Magellanic Cloud (LMC), and the Sun for reference. The grey area highlights the low-metallicity regime (12 + log(O/H) < 8.37), defined using the metallicity of the LMC.