condition mean min max ZT0-3 24.23529627 22.24977547 26.22081707 ZT4-7 4.54077813775 2.3871074515 6.694448824 ZT8-11 7.238843516 3.5806799280000003 10.897007104 ZT12-15 22.2312073225 16.10762313 28.354791515000002 ZT16-19 19.27188505 18.665593295 19.878176805000003 ZT20-23 21.635999307499997 20.528111359999997 22.743887254999997