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Table 1 Baseline characteristics of participants in the youth part of the Oslo Health Study (2000–2001) who participated in the follow-up in 2004.

From: The association between weekly hours of physical activity and mental health: A three-year follow-up study of 15–16-year-old students in the city of Oslo, Norway

Characteristics at age 15–16 Boys Girls  
  n = 1085* % n = 1348* % p, gender
Invitation group      0.489
In school 913 84.1 1148 85.2  
By mail 172 15.9 200 14.8  
Ethnic background      0.099
Ethnic Norwegian 879 81.5 1057 78.8  
Ethnic minority 200 18.5 285 21.2  
Family economic status      0.047
Very bad/Bad 285 26.6 399 30.2  
Good 634 59.2 771 58.3  
Very good 152 14.2 152 11.5  
Alcohol use last year      0.094
2–3 times per week 42 3.9 51 3.8  
Once per week 137 12.9 204 15.4  
2–3 times per month 233 21.9 245 18.5  
Once per month 94 8.8 128 9.6  
A few times 247 23.2 342 25.8  
Not at all 313 29.4 357 26.9  
Smoking      <0.001
No 844 78.2 939 70.0  
Once in a while 152 14.1 232 17.3  
Yes, daily 83 7.7 171 12.7  
Physical activity      <0.001
0 hours per week 82 7.6 143 10.6  
1–2 hours per week 202 18.8 418 31.0  
3–4 hours per week 223 20.7 361 26.8  
5–7 hours per week 263 24.4 234 17.4  
8–10 hours per week 187 17.4 96 7.1  
11 hours or more per week 120 11.1 60 4.5  
  1. *The numbers who answered the different questions differ somewhat.