condition mean min max ZT0-3 0.9157845 0.9157845 0.9157845 ZT4-7 0.373474 0.373474 0.373474 ZT8-11 0.1669752 0.1669752 0.1669752 ZT12-15 0.2324485 0.2324485 0.2324485 ZT16-19 0.18383549999999999 0.18383549999999999 0.18383549999999999 ZT20-23 1.123558 1.123558 1.123558