condition mean min max ZT0-3 6.15933 5.906219999999999 6.41244 ZT4-7 3.36213 3.36213 3.36213 ZT8-11 1.534595 1.534595 1.534595 ZT12-15 0 0 0 ZT16-19 2.0811200000000003 2.0811200000000003 2.0811200000000003 ZT20-23 1.44242 1.44242 1.44242