condition mean min max ZT0-3 21.748183333333333 20.8442 23.0467 ZT4-7 9.368415 9.368415 9.368415 ZT8-11 5.63087 5.63087 5.63087 ZT12-15 4.8969225000000005 3.69031 6.103535 ZT16-19 3.963585 3.963585 3.963585 ZT20-23 8.86563 8.86563 8.86563