condition mean min max ZT0-3 282.868403 282.868403 282.868403 ZT4-7 617.0707065 617.0707065 617.0707065 ZT8-11 638.9239640000001 638.9239640000001 638.9239640000001 ZT12-15 605.057677 605.057677 605.057677 ZT16-19 222.487337 222.487337 222.487337 ZT20-23 164.646995 164.646995 164.646995