condition mean min max ZT0-3 3.062855 2.704505 3.421205 ZT4-7 3.609415 3.609415 3.609415 ZT8-11 3.428355 3.428355 3.428355 ZT12-15 0 0 0 ZT16-19 4.691675 4.691675 4.691675 ZT20-23 3.8807650000000002 3.8807650000000002 3.8807650000000002