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Table 3 Percentage of agreement and associations (ORs) between weight classesa at different ages

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

   Overweight/obesity at 5–7 years Overweight/obesity at 15–17 years
    Crude Adjustedb   Crude Adjustedb
Age (years) Weight classa %c OR 95 % CI OR 95 % CI %c OR 95 % CI OR 95 % CI
2–4 Thin/normal weight   1.0   1.0    1.0   1.0  
Overweight/obese 52.5 11.6 (6.4–21.0) 11.0 (6.0–20.1) 39.3 3.0 (1.7–5.3) 3.2 (1.8–5.6)
5–7 Thin/normal weight   - - - -   1.0   1.0  
Overweight/obese   - - - - 63.0 11.1 (6.4–19.2) 12.1 (6.9–21.4)
  1. A sub study of The Tromsø Study: Fit Futures N = 532: 279 boys, 253 girls
  2. aWeight classes are 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]
  3. bAdjusted for gender, exact age (years, months) at first time point and time (years, months) between measurements
  4. cPercent of those overweight/obese at younger age that are still overweight at the older age = percent agreement/ positive predictive value
  5. Gender was a significant covariate p = 0.02
  6. BMI body mass index, CI confidence interval, OR odds ratio