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Table 1 Mean body mass index (BMI) for the total sample and BMI standard deviation score (SDS) status at various target ages in children with and without overweight and obesity at 8 years of age

From: Important periods of weight development in childhood: a population-based longitudinal study

Age Years, N   Total sample BMI (± SD) Not overweightc,at 8 years of age Mean BMI SDS (95% CI) Overweightc,dat 8 years of age Mean BMI SDS (95% CI) p-valuea,b Not obesec,eat 8 years of age Mean BMI SDS (95% CI) Obesecat 8 years of age Mean BMI SDS (95% CI) p-valuea,b
0.00 2920 14.20 (1.81) -0.07 (–0.11 - –0.03) 0.08 (0.00 - 0.16) 0.001 -0.05 (–0.08 - –0.01) 0.08 (–0.08 - 0.25) 0.132
0.25 2498 16.63 (1.51) -0.01 (–0.04 - 0.02) 0.39 (0.32 - 0.45) 0.000 0.05 (0.02 - 0.08) 0.49 (0.35 - 0.63) 0.000
0.50 2514 17.19 (1.51) -0.02 (–0.05 - 0.01) 0.52 (0.45 - 0.59) 0.000 0.06 (0.03 - 0.09) 0.64 (0.49 - 0.79) 0.000
0.75 2855 17.30 (1.52) 0.03 (–0.01 - 0.06) 0.67 (0.59 - 0.75) 0.000 0.12 (0.09 - 0.15) 0.82 (0.66 - 0.98) 0.000
1.00 2714 17.00 (1.41) -0.09 (–0.13 - –0.06) 0.57 (0.50 - 0.64) 0.000 0.00 (–0.03 - 0.04) 0.73 (0.58 - 0.89) 0.000
1.50 808 16.39 (1.40) -0.23 (–0.27 - –0.20) 0.47 (0.40 - 0.55) 0.000 -0.13 (–0.16 - –0.10) 0.68 (0.52 - 0.84) 0.000
2.00 2445 16.40 (1.43) -0.13 (–0.17 - –0.09) 0.69 (0.61 - 0.76) 0.000 -0.01 (–0.05 - 0.02) 0.98 (0.81 - 1.15) 0.000
4.00 2391 15.80 (1.33) 0.26 (–0.30 - –0.23) 0.82 (0.76 - 0.88) 0.000 -0.12 (–0.15 - –0.08) 1.33 (1.20 - 1.46) 0.000
6.00 2316 15.83 (1.59) 0.30 (–0.33 - –0.27) 1.09 (1.04 - 1.13) 0.000 -0.11 (–0.14 - –0.08) 1.71 (1.63 - 1.79) 0.000
8.00 3172 16.85 (2.40) -0.23 (–0.26 - –0.20) 1.35 (1.32 - 1.39) 0.000 -0.01 (–0.04 - 0.02) 2.03 (1.97 - 2.09) 0.000
  1. SD, standard deviation, CI, confidence interval.
  2. aTwo-sample independent t-test.
  3. bStatistically significant (p < .001).
  4. cBroken stick model (N = 3172).
  5. dOverweight includes obesity.
  6. eThe “not obese” group includes all other children, also those that are overweight.