Table 2: Directly adjusted BMI category distribution by weight category, age, and time.

Underweight (<5th percentile)Healthy weight (5–84.9th percentile)Overweight (85–94.9th percentile)Obese (≥95th percentile)
2003–2005a2009-2010aPercentage point differencePercent changeb2003–2005a2009-2010aPercentage point differencePercent changeb2003–2005a2009-2010aPercentage point differencePercent changeb2003–2005a2009-2010aPercentage point differencePercent changeb

Ages 02–05
223,279
2.2%
(2.1, 2.3)
2.9%
(2.8, 3.0)
+0.7+31.8%75.5%
(75.2, 75.8)
77.3%
(77.1, 77.6)
+1.8+2.4%11.0%
(10.8, 11.2)
9.7%
(9.5, 9.8)
−1.3−11.8%11.3%
(11.1, 11.5)
10.0%
(9.9, 10.2)
−1.3−11.5%
Ages 06–11
223,275
1.5%
(1.4, 1.6)
1.8%
(1.8, 1.9)
+0.3+20.0%62.3%
(61.9, 62.6)
65.1%
(64.8, 65.3)
+2.8+4.5%15.9%
(15.7, 16.2)
13.8%
(13.6, 14.0)
−2.1−13.2%20.3%
(20.0, 20.6)
19.3%
(19.1, 19.5)
−1.0−4.9%
Ages 12–19
234,120
1.5%
(1.4, 1.5)
1.6%
(1.5, 1.7)
+0.1+6.7%63.2%
(62.9, 63.5)
64.3%
(64.1, 64.6)
+1.1+1.7%16.4%
(16.1, 16.6)
14.8%
(14.6, 15.0)
−1.6−9.8%19.0%
(18.8, 19.3)
19.3%
(19.1, 19.5)
+0.31.6%
All
680,674
1.7%
(1.7, 1.8)
2.1%
(2.1, 2.2)
+0.4+23.5%67.0%
(66.7, 67.1)
68.8%
(68.7, 60.0)
+1.8+2.7%14.4%
(14.3, 14.6)
12.8%
(12.7, 12.9)
−1.6−11.1%16.9%
(16.8, 17.1)
16.3%
(16.1, 16.4)
−0.6−3.6%

Values are shown as mean (95% CI).
bPercent change = percentage point difference/percent weight category in 2003–2005.
Bold indicate statistically significant ( ) time effects.