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Table 2 Prevalence of weight classesa in the study sampleb at three ages

From: Tracking of overweight and obesity from early childhood to adolescence in a population-based cohort – the Tromsø Study, Fit Futures

Age (years) Gender Thinness Normal weight Overweight Obesity Gender differencec
% (n) % (n) % (n) % (n) p-value
2–4 Boys 14.7 (41) 76.7 (214) 7.2 (20) 1.4 (4) 0.09
Girls 14.6 (37) 70.8 (179) 13.0 (33) 1.6 (4)
5–7 Boys 7.5 (21) 82.8 (231) 6.5 (18) 3.2 (9) <0.01
Girls 10.7 (27) 71.1 (180) 12.6 (32) 5.5 (14)
15–17 Boys 9.7 (27) 69.9 (195) 13.3 (37) 7.2 (20) 0.25
Girls 5.9 (15) 74.3 (188) 14.6 (37) 5.1 (13)
  1. aWeight classes is based on BMI according to the International Obesity Taskforce’s age- and sex-specific cut-off values in children 2–18 years: thinness: adult BMI <18.5 kg/m2, normal weight: adult BMI ≥18.5- < 25 kg/m2, overweight: adult BMI ≥25- < 30 kg/m2, obesity: adult BMI ≥30 kg/m2 [28]
  2. bA sub study of The Tromsø Study: Fit Futures N = 532: 279 boys, 253 girls
  3. cPearson’s Chi-Square tests for gender differences in weight classes were performed in a 2x3 contingency table with weight class overweight/obesity merged due to few obese participants
  4. BMI body mass index