condition mean min max ZT0-3 82.711474 82.711474 82.711474 ZT4-7 87.8534515 87.8534515 87.8534515 ZT8-11 52.32079 52.32079 52.32079 ZT12-15 43.9571915 43.9571915 43.9571915 ZT16-19 42.81 42.81 42.81 ZT20-23 50.620888 50.620888 50.620888