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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
  1. *: p-value < 0.05
  2. d1: Difference of mean between 1963 and 1993
  3. d2: Difference of mean between 1993 and 2005/6
  4. d1/yr: Annual changes between 1963 to 1993
  5. d2/yr: Annual changes between 1993 to 2005/6