Decathlon World Junior all-time list (0)

When the new class U20 was formed, a different specification from that of IAAF was in force in some countries and at some competitions. At first, according to the rules of IAAF, the height of the hurdles for juniors was 107 cm, but in some countries a-metre-high hurdles were still used. What is more, sometimes a shot of 6.25 kg was used instead of a 6 kg one. All in all, it’s quite confusing. Does anyone have more information on the matter?