condition mean min max ZT0-3 4.6248000000000005 4.6248000000000005 4.6248000000000005 ZT4-7 3.8613299999999997 3.8613299999999997 3.8613299999999997 ZT8-11 2.989595 2.989595 2.989595 ZT12-15 3.845945 3.845945 3.845945 ZT16-19 4.621715 4.621715 4.621715 ZT20-23 3.66847 3.66847 3.66847