Si IIλ6355 velocities, taken from Burgaz et al. (2025) plotted against the stellar galaxy masses of the volume-limited ZTF DR2 SN Ia sample for 477 SNe Ia spectra with a phase range of −5 d ≤ t₀ ≤ 5 d. Filled and empty circles represents the SNe Ia with known redshift sources and SNID template matched sources, respectively. The horizontal black dashed line represents the value of Si IIλ6355 velocity used to separate the sample into HV and NV events for the normal SNe Ia (HV/NV can only be defined for normal SNe Ia). The vertical dashed line represents the standard value (10¹⁰ M_⊙) for separating high- and low-mass host galaxies. The bottom histograms show the cumulative fractions of the host galaxy masses for each sub-type and the full peak sample. The p-values shown are derived from two-sample K-S tests using normal SNe Ia as the reference.