condition mean min max ZT0-3 7.5097 7.372795 7.646604999999999 ZT4-7 7.371875 7.371875 7.371875 ZT8-11 21.33935 21.33935 21.33935 ZT12-15 0 0 0 ZT16-19 17.851599999999998 17.851599999999998 17.851599999999998 ZT20-23 8.23259 8.23259 8.23259