condition mean min max ZT0-3 14.450375000000001 13.8125 15.08825 ZT4-7 20.125700000000002 20.125700000000002 20.125700000000002 ZT8-11 27.735799999999998 27.735799999999998 27.735799999999998 ZT12-15 0 0 0 ZT16-19 22.7162 22.7162 22.7162 ZT20-23 22.0908 22.0908 22.0908