condition mean min max ZT0-3 186.39835 186.39835 186.39835 ZT4-7 162.474333 162.474333 162.474333 ZT8-11 172.3525085 172.3525085 172.3525085 ZT12-15 170.352781 170.352781 170.352781 ZT16-19 161.939131 161.939131 161.939131 ZT20-23 131.605524 131.605524 131.605524