condition mean min max ZT0-3 18.863799999999998 18.863799999999998 18.863799999999998 ZT4-7 16.22205 16.22205 16.22205 ZT8-11 12.0836 12.0836 12.0836 ZT12-15 9.411825 9.411825 9.411825 ZT16-19 20.60565 20.60565 20.60565 ZT20-23 22.2655 22.2655 22.2655