Characteristics   No (n=4,410) Yes (n=285) P-value
Area of residence
  Urban 63.9% 56.5% 0.0245
  Suburban 24.0% 27.0%  
  Rural 12.1% 16.5%  
Grade
  7th 49.9% 35.1% <0.0001
  8th 50.1% 64.9%  
Do you think smoking can cause bronchitis?
  No 13.3% 23.5% <0.0001
  Yes 86.8% 76.5%  
Do you think smoking can cause hypertension?
  No 63.1% 62.8% 0.912
  Yes 36.9% 37.2%  
Do you think smoking can cause lung cancer?
  No 3.6% 13.0% <0.0001
  Yes 96.4% 87.0%  
Do you think smoking can cause heart attack?
  No 63.6% 66.0% 0.4179
  Yes 36.4% 34.0%  
Do you think smoking can cause stroke?
  No 69.3% 68.8% 0.8504
  Yes 30.7% 31.2%  
Do you think smoking can help people relax?
  Yes 11.4% 36.1% <0.0001
  No 88.6% 63.9%  
Do you think smoking boys are more attractive?
  More 3.4% 14.8% <0.0001
  Less 63.9% 37.0%  
  No difference 32.7% 48.2%  
Do you think smoking girls are more attractive?
  More 4.6% 19.3% <0.0001
  Less 72.1% 51.2%  
  No difference 23.3% 29.5%  
As far as you know, does any of your friends or classmates smoke?
  None 80.7% 47.7% <0.0001
  Some 18.0% 43.2%  
  Most or all 1.2% 9.1%  
Do you think your parents would not mind your smoking after you grow up?
  No 7.4% 14.7% <0.0001
  Yes 92.7% 85.3%  
In a typical week, how many days do people smoke in your presence at home
  None 40.0% 29.8% 0.0007
  1-7 days 60.0% 70.2%  
In the past week, did you see your teachers smoking?
  No 66.7% 47.4% <0.0001
  Yes 33.3% 52.6%  
In the past semester, did the school distribute any tobacco control material to you?
  No or don't know 54.6% 57.9% 0.2771
  Yes 45.4% 42.1%  
In the past semester, did you watch any video or TV program on tobacco control on campus?
  No or don't know 64.3% 67.7% 0.2465
  Yes 35.7% 32.3%  
In the past semester, did anyone in your school teach you that smokers would have yellow teeth, wrinkles, or bad smell?
  No or don't know 57.4% 61.1% 0.2282
  Yes 42.6% 39.0%  
In the past semester, did anyone in your school teach you skills on how to refuse smoking?
  No or don't know 69.8% 73.7% 0.1678
  Yes 30.2% 26.3%  
Do you often see anti-smoking information on campus?
  No 21.0% 34.4% <0.0001
  Some times 48.5% 46.0%  
  very often 30.5% 19.7%  
Table 1: Characteristics of the sampled students in junior high schools at Ningbo City, by smoking susceptibility in the next 12 months.
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