condition mean min max ZT0-3 9.361148 9.361148 9.361148 ZT4-7 9.202698 9.202698 9.202698 ZT8-11 8.748439999999999 8.748439999999999 8.748439999999999 ZT12-15 9.049467 9.049467 9.049467 ZT16-19 8.5540135 8.5540135 8.5540135 ZT20-23 9.437726 9.437726 9.437726