condition mean min max ZT0-3 0.313638 0.1659835 0.4612925 ZT4-7 0.360072 0.360072 0.360072 ZT8-11 0.648855 0.648855 0.648855 ZT12-15 0 0 0 ZT16-19 0.6821095 0.6821095 0.6821095 ZT20-23 0.492535 0.492535 0.492535