condition mean min max ZT0-3 73.81713333333333 68.322 84.2533 ZT4-7 70.0531 70.0531 70.0531 ZT8-11 55.862700000000004 55.862700000000004 55.862700000000004 ZT12-15 38.758849999999995 35.647 41.8707 ZT16-19 18.929450000000003 18.929450000000003 18.929450000000003 ZT20-23 27.83345 27.83345 27.83345