Fig 1.
Description of how the analysis sample of adolescents was derived from recruitment for the prevalence and longitudinal analyses.
BMI, Body mass index; ht, height; wt, weight; y, years.
Table 1.
Description of the Norwegian Youth Growth Study sample (max N = 1852)*.
Table 2.
Prevalence (%, 95% CI)* of IOTF† overweight, obesity, and thinness among Norwegian 13-year-olds and mean IOTF z-score‡ (n = 1838).
Fig 2.
Predicted prevalence* of IOTF† overweight (top row), obesity (middle) and thinness (bottom) at 8 and 13 years, by sex (left), region (middle) and population density (right). IOTF, International Obesity Task Force. *Marginal estimates predicted as estimated from the random effect logistic regression models without an age interaction term, n = 1852, 3317 observations. The dots are the point estimates and the shaded area is the 95% confidence interval. The points have been staggered and joined between ages for clarity. †Categories are inclusive; overweight includes obesity and severe obesity, and similarly for categories of thinness.
Fig 3.
Marginal predicted* mean BMI IOTF z-score† by sex (left), region (middle) and population density (right). BMI: Body mass index; IOTF, International Obesity Task Force; S-E: South-East; Semi: Semi-urban. *Marginal estimates predicted from the random effect regression models, n = 1852, 3317 observations = 3317. The shaded area is the 95% confidence interval. †IOTF z-score: Age- and sex-specific standardized z-score calculated from the IOTF LMS parameters.
Table 3.
Associations* of sex, region, and population density with IOTF† overweight, obesity, and thinness from 8 to 13 years (n = 1852, 3317 observations).
Table 4.
Associations* of sex, region, and population density with mean BMI IOTF z-score† from 8 to 13 years (n = 1852, 3317 observations).