Table 2 Age-Adjusted Body Mass Index (BMI), Age-Standardized BMI,^a Age-Standardized BMI Z-scores^b and Proportion of Overweight and Obesity^c Among 957,577 Boys and 941,239 Girls Aged 6 to 18 From 1996 to 2014 in Hong Kong.

From: Divergent secular trends in blood pressure and body mass index in children and adolescents in Hong Kong

Year	n	%	Age-adjusted		Age-standardized		Age-standardized		Overweight	Obesity
			BMI (kg/m²)		BMI (kg/m²)		BMI z-score		Overweight	Obesity
			Mean	SD	Mean	SE	Mean	SD	%	%
Boys
1996	77,869	8.13	17.9	1.0	18.3	0.02	0.14	1.38	14.4	4.6
1997	86,890	9.07	18.9	1.6	18.4	0.01	−0.10	1.32	11.6	3.3
1998	57,492	6.00	18.4	1.5	18.5	0.01	0.06	1.36	13.5	4.3
1999	48,965	5.11	18.2	1.4	18.6	0.02	0.14	1.37	14.5	4.8
2000	47,379	4.95	18.2	1.3	18.6	0.02	0.18	1.37	15.0	4.9
2001	47,139	4.92	18.1	1.3	18.7	0.02	0.20	1.37	15.6	4.9
2002	49,116	5.13	18.1	1.3	18.6	0.02	0.19	1.38	15.2	5.1
2003	42,569	4.45	18.2	1.3	18.8	0.02	0.26	1.37	15.9	5.5
2004	45,208	4.72	18.2	1.3	18.8	0.02	0.27	1.37	16.4	5.5
2005	41,653	4.35	18.3	1.3	18.9	0.02	0.30	1.37	16.9	5.6
2006	42,709	4.46	18.3	1.3	18.9	0.02	0.28	1.39	17.0	5.8
2007	41,986	4.38	18.4	1.3	19.0	0.02	0.32	1.38	17.3	6.1
2008	42,254	4.41	18.4	1.3	19.1	0.02	0.37	1.39	17.8	6.8
2009	40,279	4.21	18.2	1.3	19.2	0.02	0.44	1.39	18.7	7.2
2010	34,047	3.56	18.1	1.3	19.2	0.03	0.43	1.40	18.4	7.5
2011	43,531	4.55	18.3	1.4	19.2	0.02	0.40	1.38	18.2	7.0
2012	48,459	5.06	18.1	1.5	19.1	0.02	0.35	1.37	17.3	6.6
2013	58,389	6.10	17.9	1.4	19.2	0.02	0.39	1.37	17.5	6.8
2014	61,643	6.44	17.6	1.3	19.0	0.02	0.34	1.37	15.9	6.5
Girls
1996	70,970	7.54	17.9	1.1	17.9	0.02	−0.15	1.19	10.7	2.5
1997	94,507	10.04	19.2	1.6	18.1	0.01	−0.29	1.10	8.3	1.8
1998	59,055	6.27	18.7	1.6	18.1	0.01	−0.22	1.13	9.3	2.1
1999	47,903	5.09	18.5	1.5	18.1	0.01	−0.18	1.15	10.0	2.3
2000	46,968	4.99	18.4	1.5	18.1	0.01	−0.15	1.14	10.2	2.2
2001	46,558	4.95	18.3	1.4	18.1	0.01	−0.13	1.14	10.5	2.3
2002	47,929	5.09	18.3	1.4	18.1	0.01	−0.13	1.14	10.3	2.3
2003	42,440	4.51	18.4	1.4	18.2	0.02	−0.08	1.14	11.1	2.5
2004	44,391	4.72	18.4	1.4	18.3	0.02	−0.08	1.13	11.0	2.4
2005	42,043	4.47	18.4	1.4	18.3	0.02	−0.07	1.14	11.4	2.4
2006	41,915	4.45	18.5	1.4	18.3	0.02	−0.08	1.14	11.1	2.4
2007	41,219	4.38	18.5	1.4	18.4	0.02	−0.04	1.13	11.8	2.5
2008	41,226	4.38	18.5	1.4	18.5	0.02	0.01	1.13	11.9	2.8
2009	38,416	4.08	18.4	1.4	18.5	0.02	0.05	1.13	12.8	3.1
2010	32,410	3.44	18.2	1.3	18.5	0.02	0.06	1.16	13.4	3.3
2011	41,613	4.42	18.4	1.5	18.5	0.02	0.03	1.13	12.4	3.0
2012	46,945	4.99	18.2	1.5	18.5	0.02	−0.01	1.13	11.9	2.9
2013	56,496	6.00	18.0	1.5	18.5	0.02	0.02	1.12	12.0	2.9
2014	58,235	6.19	17.7	1.4	18.4	0.02	−0.01	1.11	11.1	2.9

Abbreviations: BMI: body mass index, SD: standard deviation; SE: standard error; z-score: standard deviation score. ^aAge-standardized BMI relative to the 2000 World Health Organization World Population Standard. ^bMean BMI in z-score relative to the 2007 World Health Organization growth references for 5–19 years: 1 unit change in BMI z-score is approximated to 2.67 kg/m². ^cOverweight was defined using the International Obesity Task Force cut-offs as equivalent to an adult BMI of 25 or more; Obesity was defined as equivalent to an adult BMI of 30 or more.

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Table 2 Age-Adjusted Body Mass Index (BMI), Age-Standardized BMI,^a Age-Standardized BMI Z-scores^b and Proportion of Overweight and Obesity^c Among 957,577 Boys and 941,239 Girls Aged 6 to 18 From 1996 to 2014 in Hong Kong.

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