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Table 1 Comparison of mean height (cm) of Hong Kong children and adolescents aged 6 to 18 y by gender in 1963, 1993 and 2005/6, 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              
6 283 110.7 5.1 223 116.0 5.4 138 117.9 4.5 5.3* 0.18 1.9* 0.15
7 742 115.5 5.3 643 120.6 5.6 483 122.9 5.8 5.1* 0.17 2.2* 0.18
8 1030 120.5 5.5 724 126.1 5.4 564 127.9 5.9 5.6* 0.19 1.8* 0.14
9 1076 125.2 5.7 634 131.0 5.8 640 133.1 5.7 5.8* 0.19 2.1* 0.16
10 1144 130.0 6.1 694 136.3 5.9 602 138.5 6.5 6.3* 0.21 2.1* 0.17
11 1121 134.8 6.6 597 141.6 6.5 636 143.5 7.2 6.8* 0.23 1.9* 0.15
12 1033 140.0 7.3 638 147.8 8.0 739 151.0 8.1 7.8* 0.26 3.2* 0.25
13 1052 147.0 8.2 642 155.3 8.6 647 158.2 8.5 8.3* 0.28 3.0* 0.22
14 1288 155.6 7.8 550 162.3 7.9 672 164.2 7.6 6.7* 0.22 1.9* 0.15
15 1622 161.5 6.6 479 166.9 6.2 588 167.9 6.0 5.4* 0.18 1.0* 0.08
16 1711 164.9 5.8 430 169.5 6.5 562 170.6 5.5 4.6* 0.15 1.1* 0.08
17 1370 166.8 5.3 442 169.8 5.8 572 171.4 5.9 3.0* 0.1 1.6* 0.12
18 874 167.0 5.1 311 170.7 5.9 468 171.7 5.5 3.7* 0.12 1.0* 0.08
Girls              
6 282 110.0 4.7 211 115.4 5.5 128 117.3 5.0 5.4* 0.18 1.9* 0.15
7 742 114.7 5.1 553 119.8 5.1 488 120.8 5.3 5.1* 0.17 0.9* 0.08
8 970 120.0 5.6 647 125.2 5.6 471 127.2 5.5 5.2* 0.17 2.0* 0.15
9 1022 125.1 6.2 617 131.1 6.3 601 132.7 6.3 6.0* 0.2 1.7* 0.12
10 1178 130.5 6.7 633 137.1 6.9 554 138.4 6.8 6.6* 0.22 1.3* 0.1
11 1312 136.6 7.2 584 143.7 7.2 584 145.4 7.0 7.1* 0.24 1.7* 0.13
12 1340 144.0 7.5 579 149.6 6.7 734 151.5 6.4 5.6* 0.19 1.9* 0.15
13 1159 150.0 6.9 633 153.2 5.9 640 155.2 6.0 3.2* 0.11 2.0* 0.15
14 1152 154.0 6.1 617 156.3 5.4 667 157.0 5.3 2.3* 0.08 0.8* 0.05
15 1275 155.4 5.4 552 157.0 5.3 637 157.9 5.2 1.6* 0.05 1.0* 0.07
16 1267 155.6 5 520 157.3 5.1 590 158.4 5.4 1.7* 0.06 1.1* 0.08
17 984 155.6 4.9 536 157.8 5.3 642 158.7 5.4 2.2* 0.07 0.9* 0.07
18 614 155.6 4.7 334 158.3 5.3 453 158.7 5.7 2.7* 0.09 0.4 0.03
  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