condition mean min max ZT0-3 14.32968 6.15294 20.52345 ZT4-7 26.143250000000002 26.143250000000002 26.143250000000002 ZT8-11 21.35315 21.35315 21.35315 ZT12-15 15.3727475 9.877795 20.8677 ZT16-19 14.5817 14.5817 14.5817 ZT20-23 9.482595 9.482595 9.482595