90-Day Cancer Mortality

During the pandemic the mortality association attenuated for Swedish-born patients but strengthened markedly for Western migrants. Elevated mortality in high migrant density areas persisted after full adjustment for area deprivation, pointing to factors beyond economic disadvantage such as access to palliative care and timely follow-up. Swedish-born patients in high migrant density neighbourhoods had a 15% higher rate of 90-day mortality than those in low-density areas pre-pandemic, after full adjustment. Statistically significant mortality associations with migrant density were primarily concentrated in patients aged 65 and older. No statistically significant association between migrant density and 90-day mortality was found for non-Western migrants before the pandemic, though the interaction test indicated differential patterns across groups. Western migrants in high migrant density areas had a 9% higher 90-day mortality rate than those in low-density areas pre-pandemic.