The study looked at how people in Beijing have changed their lifestyles over the past 40 years and how this affects how they travel. They used a survey to group people based on where they live and work, and then used a statistical method to see how these groups influence how they get around. The researchers found that people's lifestyles in Beijing have a big impact on how they travel, including how much they spend, how they use their time, and what activities they do.