condition mean min max ZT0-3 0.5536628333333333 0.3382795 0.6819839999999999 ZT4-7 0.76822 0.76822 0.76822 ZT8-11 0.86502 0.86502 0.86502 ZT12-15 2.21549 1.4766949999999999 2.954285 ZT16-19 0.873415 0.873415 0.873415 ZT20-23 0.940116 0.940116 0.940116