condition mean min max ZT0-3 1.3682619999999999 1.276039 1.4604849999999998 ZT4-7 0.8880015 0.8880015 0.8880015 ZT8-11 1.192685 1.192685 1.192685 ZT12-15 0 0 0 ZT16-19 1.57746 1.57746 1.57746 ZT20-23 1.1691215 1.1691215 1.1691215