condition mean min max ZT0-3 1.02249609525 0.651179232 1.3938129584999999 ZT4-7 1.62003690125 0.539991697 2.7000821055 ZT8-11 2.3165384527499997 1.5615275315 3.071549374 ZT12-15 26.050704236250002 20.9467653025 31.154643170000003 ZT16-19 18.41501349 15.398829665 21.431197315 ZT20-23 9.783474333500001 6.631716647 12.93523202