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.
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 | |