condition mean min max ZT0-3 0.742247 0.7307365 0.7537575 ZT4-7 0.9406495 0.9406495 0.9406495 ZT8-11 0.737086 0.737086 0.737086 ZT12-15 0 0 0 ZT16-19 1.620935 1.620935 1.620935 ZT20-23 1.63933 1.63933 1.63933