| Mean height of Jp. school boys: 3 year moving averages (cm) | |||||||||||
| Age/year | 1960 | 1965 | 1970 | 1975 | 1980 | 1985 | 1990 | 1995 | 2000 | 2005 | 2010 |
| 6 | 111.9 | 113.4 | 114.5 | 115.2 | 115.7 | 116.4 | 116.8 | 116.8 | 116.7 | 116.7 | 116.7 |
| 7 | 117.2 | 118.8 | 120.0 | 120.8 | 121.3 | 122.1 | 122.5 | 122.6 | 122.4 | 122.5 | 122.6 |
| 8 | 122.2 | 124.0 | 125.4 | 126.3 | 126.8 | 127.5 | 128.0 | 128.1 | 128.1 | 128.2 | 128.2 |
| 9 | 127.0 | 128.8 | 130.3 | 131.4 | 132.0 | 132.7 | 133.3 | 133.5 | 133.5 | 133.6 | 133.5 |
| 10 | 131.8 | 133.6 | 135.2 | 136.5 | 137.2 | 137.7 | 138.5 | 138.9 | 139.0 | 138.9 | 138.8 |
| 11 | 136.5 | 138.6 | 140.4 | 141.9 | 142.8 | 143.3 | 144.4 | 144.9 | 145.3 | 145.1 | 145.0 |
| 12 | 142.1 | 144.7 | 147.0 | 148.6 | 149.5 | 150.1 | 151.5 | 152.0 | 152.8 | 152.6 | 152.4 |
| 13 | 148.7 | 151.8 | 154.0 | 156.0 | 157.1 | 157.6 | 158.9 | 159.5 | 160.1 | 159.9 | 159.7 |
| 14 | 155.3 | 158.2 | 160.5 | 162.2 | 163.3 | 163.8 | 164.6 | 165.1 | 165.5 | 165.3 | 165.1 |
| 15 | 161.5 | 163.5 | 164.7 | 166.1 | 167.0 | 167.5 | 167.9 | 168.4 | 168.6 | 168.4 | 168.3 |
| 16 | 163.8 | 165.7 | 166.9 | 167.9 | 168.8 | 169.3 | 169.6 | 170.1 | 170.1 | 170.0 | 169.9 |
| 17 | 165.1 | 166.7 | 167.9 | 168.8 | 169.6 | 170.2 | 170.5 | 170.9 | 170.9 | 170.8 | 170.7 |