condition mean min max ZT0-3 11.87235 10.805250000000001 12.93945 ZT4-7 5.393275 5.393275 5.393275 ZT8-11 4.3839999999999995 4.3839999999999995 4.3839999999999995 ZT12-15 0 0 0 ZT16-19 6.313470000000001 6.313470000000001 6.313470000000001 ZT20-23 8.021815 8.021815 8.021815