condition mean min max ZT0-3 15.34395 15.3306 15.357299999999999 ZT4-7 13.8604 13.8604 13.8604 ZT8-11 10.747 10.747 10.747 ZT12-15 0 0 0 ZT16-19 20.05945 20.05945 20.05945 ZT20-23 15.73635 15.73635 15.73635