Good morning, class. Today we're discussing the impact of urban green spaces on mental health. A recent study from the University of Melbourne followed 2,000 adults over five years. Participants who visited parks or gardens at least three times a week reported a 25% lower risk of developing symptoms of depression. Interestingly, the duration of each visit mattered more than the intensity of exercise. Even short walks of 20 minutes were beneficial, but only if they occurred in natural settings. The researchers also noted that the positive effect was stronger for older adults, especially those over 65, compared to younger participants. However, they emphasized that this was an observational study, so causation cannot be confirmed.
❓ According to the lecture, which factor was most important for reducing depression symptoms?
A. A. The frequency of visits per week
B. B. The length of each visit to green spaces
C. C. The intensity of physical exercise during visits