condition mean min max ZT0-3 5.885023333333333 3.27991 7.325365 ZT4-7 0.4093825 0.4093825 0.4093825 ZT8-11 4.22521 4.22521 4.22521 ZT12-15 7.8029775 6.06719 9.538765 ZT16-19 9.048375 9.048375 9.048375 ZT20-23 9.037165 9.037165 9.037165