Table 1.

Mean BMI Values for 276,835 Children 7 to 13 Years of Age.^*

Age	Boys (N = 139,857)		Girls (N = 136,978)
	BMI	Weight Equivalent to a 1-Unit Increase in BMI z Score†	BMI	Weight Equivalent to a 1-Unit Increase in BMI z Score†
	mean ±SD	kg	mean ±SD	kg
7 yr	15.5±1.2	1.96	15.4±1.4	2.17
8 yr	15.8±1.3	2.44	15.8±1.5	2.66
9 yr	16.2±1.5	2.96	16.2±1.7	3.25
10 yr	16.6±1.6	3.58	16.6±1.9	3.91
11 yr	17.0±1.8	4.22	17.1±2.0	4.67
12 yr	17.5±2.0	4.90	17.8±2.2	5.58
13 yr	18.1±2.1	5.60	18.6±2.4	6.30

^*BMI denotes body-mass index, which is the weight in kilograms divided by the square of the height in meters. Values are from the Copenhagen School Health Records Register.

^†Calculations are based on children of average height at each age.