condition mean min max ZT0-3 3.9381950000000003 3.9027700000000003 3.9736200000000004 ZT4-7 3.567715 3.567715 3.567715 ZT8-11 3.279515 3.279515 3.279515 ZT12-15 0 0 0 ZT16-19 4.29772 4.29772 4.29772 ZT20-23 4.2210149999999995 4.2210149999999995 4.2210149999999995