Table 4.
Trends in Mean and Median Body Mass Index Among Children and Adolescents From 2 Through 19 Years of Agea
| Body Mass Indexb |
|||
|---|---|---|---|
| By Age Group | Unweighted Sample Size | Mean (95% CI)c | Median (IQR) |
| Males | |||
| 2–5 y | |||
| 1999–2000 | 374 | 16.2 (15.9–16.5) | 16.0 (1.7) |
| 2001–2002 | 383 | 16.5 (16.1–16.9) | 16.1 (1.8) |
| 2003–2004 | 402 | 16.7 (16.4–16.9) | 16.3 (2.1) |
| 2005–2006 | 473 | 16.3 (16.1–16.5) | 16.0 (1.9) |
| 2007–2008 | 465 | 16.3 (16.1–16.5) | 16.0 (1.8) |
| 2009–2010 | 471 | 16.6 (16.4–16.8) | 16.2 (2.1) |
| 6–11 y | |||
| 1999–2000 | 542 | 17.9 (17.4–18.4) | 17.0 (3.8) |
| 2001–2002 | 581 | 18.5 (17.9–19.0) | 17.2 (4.5) |
| 2003–2004 | 463 | 18.4 (18.0–18.9) | 17.1 (4.9) |
| 2005–2006 | 550 | 18.2 (17.8–18.6) | 17.0 (3.5) |
| 2007–2008 | 595 | 18.6 (18.0–19.1) | 17.2 (5.2) |
| 2009–2010 | 621 | 18.3 (18.2–18.5) | 17.0 (5.0) |
| 12–19 y | |||
| 1999–2000 | 1155 | 22.9 (22.3–23.4) | 21.6 (6.1) |
| 2001–2002 | 1162 | 23.1 (22.7–23.4) | 21.8 (6.1) |
| 2003–2004 | 1139 | 23.4 (22.7–24.1) | 22.1 (6.8) |
| 2005–2006 | 1091 | 23.2 (22.4–23.9) | 21.8 (6.3) |
| 2007–2008 | 641 | 23.5 (22.8–24.2) | 22.1 (7.0) |
| 2009–2010 | 685 | 23.8 (23.1–24.5) | 22.5 (6.5) |
| Females | |||
| 2–5 y | |||
| 1999–2000 | 352 | 16.1 (15.8–16.4) | 15.7 (1.9) |
| 2001–2002 | 412 | 16.1 (15.9–16.4) | 15.8 (2.2) |
| 2003–2004 | 417 | 16.3 (16.0–16.6) | 15.9 (2.0) |
| 2005–2006 | 479 | 16.2 (16.1–16.4) | 15.9 (1.8) |
| 2007–2008 | 388 | 16.3 (15.9–16.6) | 15.9 (1.7) |
| 2009–2010 | 432 | 16.2 (16.0–16.5) | 15.8 (2.0) |
| 6–11 y | |||
| 1999–2000 | 506 | 18.0 (17.5–18.6) | 16.7 (4.7) |
| 2001–2002 | 584 | 18.4 (17.7–19.1) | 17.3 (4.6) |
| 2003–2004 | 519 | 18.9 (18.6–19.3) | 17.5 (5.4) |
| 2005–2006 | 564 | 18.2 (17.7–18.7) | 17.0 (4.2) |
| 2007–2008 | 602 | 18.5 (18.0–19.0) | 17.1 (5.1) |
| 2009–2010 | 592 | 18.5 (18.2–18.8) | 17.4 (4.8) |
| 12–19 y | |||
| 1999–2000 | 1110 | 23.3 (22.8–23.8) | 21.9 (5.9) |
| 2001–2002 | 1139 | 23.1 (22.6–23.6) | 21.6 (6.1) |
| 2003–2004 | 1021 | 23.6 (22.8–24.4) | 22.0 (6.1) |
| 2005–2006 | 1050 | 23.6 (23.0–24.2) | 21.8 (7.1) |
| 2007–2008 | 558 | 23.4 (22.7–24.0) | 22.0 (6.3) |
| 2009–2010 | 607 | 23.6 (23.1–24.2) | 22.2 (6.4) |
Abbreviation: IQR, interquartile range (75th percentile-25th percentile).
a
Data are from the National Health and Nutrition Examination Survey. All data except sample size are weighted.
b
Calculated as weight in kilograms divided by height in meters squared and rounded to 1 decimal place.
c
The confidence intervals were constructed using the Wald method.