condition mean min max ZT0-3 20.095774999999996 17.2963 22.895249999999997 ZT4-7 29.607300000000002 29.607300000000002 29.607300000000002 ZT8-11 41.21515 41.21515 41.21515 ZT12-15 0 0 0 ZT16-19 27.0698 27.0698 27.0698 ZT20-23 24.3384 24.3384 24.3384