Overview of redshift and host galaxy mass distributions. Left panel: redshift distribution of the SNe IIn in Nyholm et al. (2020) and SLSN-IIn from PTF. Both are subsamples of the full PTF SNe IIn and SLSNe-IIn samples. The redshifts can be found in Schulze et al. (2021). Right panel: distribution of the host galaxy masses corresponding to the same SNe IIn from Nyholm et al. (2020) and a subsample of SLSNe-IIn from the PTF. These subsample distributions are consistent with the full sample distributions of SNe IIn and SLSNe-IIn from Schulze et al. (2021).