condition mean min max ZT0-3 4.7837499999999995 4.73405 4.83345 ZT4-7 6.789294999999999 6.789294999999999 6.789294999999999 ZT8-11 6.691115 6.691115 6.691115 ZT12-15 0 0 0 ZT16-19 9.148825 9.148825 9.148825 ZT20-23 8.028655 8.028655 8.028655