condition mean min max ZT0-3 12.734094 12.734094 12.734094 ZT4-7 17.456483 17.456483 17.456483 ZT8-11 16.158938499999998 16.158938499999998 16.158938499999998 ZT12-15 15.550787 15.550787 15.550787 ZT16-19 12.2200655 12.2200655 12.2200655 ZT20-23 12.0982115 12.0982115 12.0982115