We wanted to find out which factors in the built environment were the most important for psychological wellbeing so that cities can be designed better to be both sustainable and supportive of mental health.

A hectare of land can house the same amount of population with dense low-rises or sparse high-rises. High rises can be either in dense bustling business districts or in less dense city areas with fancy apartments facing a large green.

Suburbs, however, tend to have a medium density of low-rise buildings. Which approach should we take?