condition mean min max ZT0-3 0.04240175 0.0 0.0848035 ZT4-7 0.21826600000000002 0.21826600000000002 0.21826600000000002 ZT8-11 0.088366 0.088366 0.088366 ZT12-15 0 0 0 ZT16-19 0.12822260000000002 0.12822260000000002 0.12822260000000002 ZT20-23 0.0427479 0.0427479 0.0427479