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Table 4 Total Impact score according to weekly hours of physical activity. Percentage (p%) with high score* and odds ratio (OR) for high score* at age 18–19 years according to hours of physical activity per week at age 15–16 years, in boys and girls–unadjusted (crude) and adjusted for confounders and mental health at baseline.

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

Physical activity per week
(age 15–16)
Boys Girls
    Crude Adjusted**    Crude Adjusted**
  n p%*** OR 95%Cl OR 95%Cl n p%*** OR 95%Cl OR 95%Cl
0 hours 79 22.8 ref.   ref.   139 36.7 ref.   ref.  
1–4 hours 423 17.3 0.71 0.39 – 1.27 0.79 0.42 – 1.49 775 28.8 0.67 0.46 – 0.98 0.82 0.53 – 1.24
5–7 hours 262 10.3 0.39 0.20 – 0.75 0.51 0.25 – 1.04 232 24.6 0.56 0.36 – 0.89 0.76 0.45 – 1.27
8 or more hours 304 17.1 0.70 0.38 – 1.28 0.84 0.44 – 1.64 155 29.7 0.73 0.45 – 1.19 1.05 0.61 – 1.81
  1. *High total impact score ≥1
  2. **Invitation group, Ethnicity, Family economy, smoking and alcohol habit, SDQ total at baseline
  3. ***Percent of n with high total impact score