condition mean min max ZT0-3 36.55035 36.55035 36.55035 ZT4-7 23.0484 23.0484 23.0484 ZT8-11 30.47285 30.47285 30.47285 ZT12-15 35.956599999999995 35.956599999999995 35.956599999999995 ZT16-19 41.94015 41.94015 41.94015 ZT20-23 35.07215 35.07215 35.07215