The team gathered data from more than 200,000 people living in Sweden. Those individuals were all born between 1972 and 1977. The scientists analyzed diagnoses of schizophrenia and other psychoses recorded in Sweden's national health registry (档案室) up until 2003.

　　The team analyzed multiple variables (可变因素) related to the individuals, including the schools they attended and the neighbourhoods they lived in. Out of all the variables examined, a weak social connection at the school level was the most significant. This finding turned up in the proportion of kids who were immigrants, who changed cities between ages 8 and 16 or who were raised in a single­parent home.

　　Limits of the study included a lack of data on potentially important variables such as drug use. Additionally, the researchers noted an inherent difficulty in adequately measuring neighbourhood or area­level social fragmentation.

　　Invite a few friends and get out of the city for a walk in nature. Other studies have shown getting outdoors for some “green exercise” may help curb depression too. Other research has shown that social networks provide support to promote mental health. In fact, recent research showed happy people talk more.

　　A new finding: City living can make people crazy

　　Result of the

　　research People will feel disconnected and socially isolated when living in cities (1)____ with people.

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