condition mean min max ZT0-3 163.871684 163.871684 163.871684 ZT4-7 171.3676295 171.3676295 171.3676295 ZT8-11 178.98979400000002 178.98979400000002 178.98979400000002 ZT12-15 190.008778 190.008778 190.008778 ZT16-19 184.54170649999998 184.54170649999998 184.54170649999998 ZT20-23 233.973985 233.973985 233.973985