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Table 2 Comparison of mean weight (kg) 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 17.5 1.5 223 21.3 4.5 138 22.4 3.3 3.8* 0.13 1.1* 0.08
7 742 19.0 2.2 643 22.9 4.5 483 24.9 5.7 3.9* 0.13 2.0* 0.15
8 1030 20.6 2.6 724 25.7 5.2 564 27.7 6.4 5.1* 0.17 2.0* 0.15
9 1076 22.4 3.1 634 28.8 6.5 640 30.5 6.7 6.4* 0.21 1.7* 0.13
10 1144 24.6 3.9 694 32.4 8.0 602 35.5 9.2 7.8* 0.26 3.1* 0.24
11 1121 27.1 4.8 597 36.3 8.9 636 38.8 9.8 9.2* 0.31 2.5* 0.19
12 1033 30.0 5.9 638 39.9 10.0 739 44.4 10.8 9.9* 0.33 4.5* 0.35
13 1052 34.5 7.0 642 44.9 10.8 647 49.4 12.3 10.4* 0.35 4.5* 0.35
14 1288 40.0 6.8 550 50.5 10.5 672 53.3 11.0 10.5* 0.35 2.8* 0.22
15 1622 45.6 6.4 479 53.8 10.4 588 57.3 11.5 8.2* 0.27 3.5* 0.27
16 1711 49.0 6.0 430 57.5 9.8 562 59.5 11.2 8.5* 0.28 2.0* 0.15
17 1370 51.3 5.9 442 59.1 9.1 572 61.3 11.6 7.8* 0.26 2.2* 0.17
18 874 52.3 5.9 311 60.3 9.4 468 62.0 10.5 8.0* 0.27 1.7* 0.13
Girls              
6 282 16.9 1.7 211 20.2 3.5 128 21.3 4.0 3.3* 0.11 1.1* 0.08
7 742 18.3 2.3 553 22.1 4.3 488 23.0 4.7 3.8* 0.13 1.0* 0.07
8 970 20.2 2.9 647 24.9 5.1 471 26.1 5.1 4.7* 0.16 1.2* 0.09
9 1022 22.4 3.5 617 27.9 6.2 601 29.5 6.4 5.5* 0.18 1.6* 0.12
10 1178 25.0 4.2 633 31.4 7.1 554 33.2 7.8 6.4* 0.21 1.8* 0.14
11 1312 28.0 5.4 584 35.9 8.5 584 37.2 8.3 7.9* 0.26 1.3* 0.10
12 1340 32.7 6.8 579 40.3 8.7 734 42.6 9.6 7.6* 0.25 2.3* 0.18
13 1159 37.3 6.9 633 44.3 9.7 640 46.5 8.8 7.0* 0.23 2.2* 0.17
14 1152 41.4 6.3 617 47.6 8.4 667 48.4 8.5 6.2* 0.21 0.7 0.06
15 1275 43.6 5.7 552 48.7 7.0 637 49.5 8.9 5.1* 0.17 0.8 0.06
16 1267 44.5 5.3 520 49.5 7.4 590 51.1 9.1 5.0* 0.17 1.7* 0.12
17 984 45.1 5.1 536 50.5 7.2 642 51.1 9.5 5.4* 0.18 0.6 0.05
18 614 45.5 5.1 334 51.0 6.9 453 51.3 8.3 5.5* 0.18 0.4 0.02
  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