condition mean min max ZT0-3 4896.471111 4896.471111 4896.471111 ZT4-7 4768.741111333333 4768.741111333333 4768.741111333333 ZT8-11 5893.917778 5893.917778 5893.917778 ZT12-15 5068.891111 5068.891111 5068.891111 ZT16-19 4335.575555666666 4335.575555666666 4335.575555666666 ZT20-23 6014.391111 6014.391111 6014.391111