condition mean min max ZT0-3 2.9390975 2.40538 3.4728149999999998 ZT4-7 2.646585 2.646585 2.646585 ZT8-11 3.9346750000000004 3.9346750000000004 3.9346750000000004 ZT12-15 0 0 0 ZT16-19 5.9122 5.9122 5.9122 ZT20-23 3.5673649999999997 3.5673649999999997 3.5673649999999997