condition mean min max ZT0-3 1.2340328333333335 0.469105 2.2545385000000002 ZT4-7 0.0 0.0 0.0 ZT8-11 1.796675 1.796675 1.796675 ZT12-15 2.0816687500000004 1.4324805 2.7308570000000003 ZT16-19 4.28325 4.28325 4.28325 ZT20-23 1.4529130000000001 1.4529130000000001 1.4529130000000001