Ting PZY, Ho AFW, Lin X, et al. - In Singapore, several city-wide interventions, such as dispatcher-assisted CPR, community CPR training and smartphone activation of volunteers, have been implemented to raise bystander CPR (BCPR) rates for out-of-hospital cardiac arrest (OHCA). Researchers here evaluated the characteristics, processes-of-care and outcome differences between residential and non-residential OHCA. Further, they investigated the differences in temporal trends of BCPR rates. In this national, observational study, data were used from the prospective Pan-Asian Resuscitation Outcomes Study in Singapore from 2010 - to 2016. They identified 8,397 cases as eligible for this analysis; of these, 5,990 (71.3%) were residential. Significantly lower BCPR and bystander automated external defibrillator (AED) rates were reported in residential as compared with non-residential arrests. Poorer bystander intervention and survival were reported in residential cardiac arrests from 2010 to 2016 in Singapore. More improvement was observed for BCPR in residential arrests vs non-residential arrests over a period of city-wide interventions to improve BCPR.