condition mean min max ZT0-3 20.317175000000002 17.744500000000002 22.889850000000003 ZT4-7 13.1661 13.1661 13.1661 ZT8-11 12.812249999999999 12.812249999999999 12.812249999999999 ZT12-15 0 0 0 ZT16-19 15.3125 15.3125 15.3125 ZT20-23 18.0509 18.0509 18.0509