Table 3 Comparison of mean body mass index (BMI, kg/m2) of Hong Kong children and adolescents aged 6 to 18 y by gender in 1963, 1993 and 2006, with age groups defined as > 5.5–6.5 = 6 y
From: Secular changes in height, weight and body mass index in Hong Kong Children
1963 | 1993 | 2005/6 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Age | n | Mean | SD | n | Mean | SD | n | Mean | SD | d1 | d1/yr | d2 | d2/yr |
Boys | |||||||||||||
6 | 283 | 14.1 | 1.0 | 223 | 15.7 | 2.0 | 138 | 16.0 | 1.9 | 1.6* | 0.05 | 0.3 | 0.02 |
7 | 742 | 14.1 | 1.0 | 643 | 15.7 | 2.3 | 483 | 16.4 | 2.7 | 1.5* | 0.05 | 0.7* | 0.05 |
8 | 1030 | 14.3 | 1.2 | 724 | 16.0 | 2.4 | 564 | 16.8 | 2.7 | 1.8* | 0.06 | 0.7* | 0.06 |
9 | 1076 | 14.9 | 1.1 | 634 | 16.6 | 2.9 | 640 | 17.1 | 2.8 | 1.8* | 0.06 | 0.4* | 0.04 |
10 | 1144 | 14.6 | 1.4 | 694 | 17.3 | 3.2 | 602 | 18.3 | 3.6 | 2.7* | 0.09 | 1.0* | 0.08 |
11 | 1121 | 14.6 | 1.6 | 597 | 18.0 | 3.4 | 636 | 18.7 | 3.5 | 3.4* | 0.11 | 0.7* | 0.05 |
12 | 1033 | 15.4 | 1.8 | 638 | 18.1 | 3.4 | 739 | 19.3 | 3.6 | 2.7* | 0.09 | 1.2* | 0.09 |
13 | 1052 | 16.1 | 1.9 | 642 | 18.4 | 3.4 | 647 | 19.5 | 3.7 | 2.4* | 0.08 | 1.1* | 0.08 |
14 | 1288 | 16.7 | 1.8 | 550 | 19.0 | 3.2 | 672 | 19.7 | 3.4 | 2.3* | 0.08 | 0.6* | 0.05 |
15 | 1622 | 17.4 | 1.8 | 479 | 19.3 | 3.3 | 588 | 20.3 | 3.6 | 1.8* | 0.06 | 1.0* | 0.08 |
16 | 1711 | 17.9 | 1.9 | 430 | 20.0 | 3.0 | 562 | 20.4 | 3.5 | 2.1* | 0.07 | 0.4 | 0.03 |
17 | 1370 | 18.4 | 1.9 | 442 | 20.5 | 2.9 | 572 | 20.8 | 3.6 | 2.1* | 0.07 | 0.4 | 0.02 |
18 | 874 | 18.7 | 1.8 | 311 | 20.7 | 2.8 | 468 | 21.0 | 3.3 | 2.0* | 0.07 | 0.4 | 0.02 |
Girls | |||||||||||||
6 | 282 | 13.8 | 1.0 | 211 | 15.1 | 1.5 | 128 | 15.4 | 2.0 | 1.3* | 0.04 | 0.3 | 0.02 |
7 | 742 | 13.9 | 1.0 | 553 | 15.3 | 2.3 | 488 | 15.7 | 2.4 | 1.4* | 0.05 | 0.4* | 0.03 |
8 | 970 | 14.0 | 1.1 | 647 | 15.8 | 2.4 | 471 | 16.0 | 2.4 | 1.8* | 0.06 | 0.3 | 0.02 |
9 | 1022 | 14.3 | 1.3 | 617 | 16.1 | 2.5 | 601 | 16.6 | 2.6 | 1.9* | 0.06 | 0.5* | 0.04 |
10 | 1178 | 14.5 | 1.4 | 633 | 16.6 | 2.7 | 554 | 17.2 | 3.0 | 2.0* | 0.07 | 0.6* | 0.05 |
11 | 1312 | 15.0 | 1.6 | 584 | 17.2 | 3.0 | 584 | 17.5 | 2.9 | 2.2* | 0.07 | 0.2 | 0.02 |
12 | 1340 | 15.6 | 1.9 | 579 | 17.9 | 3.0 | 734 | 18.4 | 3.3 | 2.3* | 0.08 | 0.5* | 0.04 |
13 | 1159 | 16.5 | 2.0 | 633 | 18.8 | 3.4 | 640 | 19.2 | 3.2 | 2.3* | 0.08 | 0.5* | 0.03 |
14 | 1152 | 17.4 | 2.1 | 617 | 19.5 | 3.0 | 667 | 19.6 | 3.0 | 2.1* | 0.07 | 0.1 | 0.01 |
15 | 1275 | 18.0 | 2.0 | 552 | 19.7 | 2.6 | 637 | 19.8 | 3.1 | 1.7* | 0.06 | 0.1 | 0.01 |
16 | 1267 | 18.4 | 2.0 | 520 | 20.0 | 2.8 | 590 | 20.4 | 3.4 | 1.6* | 0.05 | 0.4* | 0.03 |
17 | 984 | 18.6 | 1.9 | 536 | 20.3 | 2.7 | 642 | 20.3 | 3.6 | 1.7* | 0.06 | 0 | 0 |
18 | 614 | 18.8 | 2.0 | 334 | 20.3 | 2.5 | 453 | 20.4 | 2.8 | 1.6* | 0.05 | 0.1 | 0.01 |