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

BMC Public Health

Table 2 Absolute changes in BMI SDS and rates of change in BMI SDS during each period in children who were or were not overweight or obese at 8 years of age ^c

Age, years	Not overweight at 8 years^a,d	Overweight^dat 8 years^d	Obese at 8 years^a	Overweight^dvs. not overweight		Obese versus not obese^e
Age, years	Not overweight at 8 years^a,d	Overweight^dat 8 years^d	Obese at 8 years^a	ΔSDS^b(95% CI)	ΔSDS/year^b(95% CI)	ΔSDS^b(95% CI)	ΔSDS/year^b(95% CI)
0.00–0.25	0.06	0.31	0.41	0.25 (0.16–0.34)*	0.99 (0.63–1.35)	0.31 (0.14–0.49)*	1.25 (0.55–1.95)
0.25–0.50	-0.01	0.13	0.15	0.14 (0.11–0.17)*	0.57 (0.44–0.69)	0.14 (0.08–0.21)*	0.57 (0.31–0.82)
0.50–0.75	0.05	0.15	0.18	0.11 (0.09–0.12)*	0.42 (0.35–0.50)	0.12 (0.08–0.16)*	0.47 (0.32–0.63)
0.75–1.00	-0.12	-0.10	-0.09	0.01 (0.0–0.03)	0.05 (–0.01–0.11)	0.03 (0.0–0.05)	0.10 (0.01–0.22)
1.00–1.50	-0.14	-0.09	-0.05	0.05 (0.03–0.07)*	0.10 (0.05–0.14)	0.08 (0.03–0.13)*	0.16 (0.07–0.25)
1.50–2.00	0.10	0.21	0.30	0.11 (0.08–0.14)*	0.22 (0.16–0.27)	0.18 (0.12–0.25)*	0.37 (0.24–0.50)
2.00–4.00	-0.13	0.13	0.35	0.27 (0.22–0.31)*	0.13 (0.11–0.15)	0.45 (0.36–0.55)*	0.23 (0.18–.028)
4.00–6.00	-0.04	0.27	0.38	0.30 (0.27–0.34)*	0.15 (0.14–0.17)	0.37 (0.30–0.44)*	0.18 (0.15–0.22)
6.00–8.00	0.07	0.27	0.32	0.20 (0.17–0.22)*	0.10 (0.09–0.11)	0.22 (0.18–0.27)*	0.11 (0.09–0.13)

CI, confidence interval.
^aChange in BMI SDS (absolute change over the specified interval).
^bDifference between groups of the absolute change over the specified interval (ΔSDS) of the change expressed as ΔSDS/year.
^cBroken stick model (N = 3172).
^dOverweight includes obesity.
^eThe “not obese” group includes all other children, also those that are overweight.
T-tests were used for comparing groups: *p < .001.

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