condition mean min max ZT0-3 18.709 18.37905 19.03895 ZT4-7 11.75565 11.75565 11.75565 ZT8-11 5.356595 5.356595 5.356595 ZT12-15 0 0 0 ZT16-19 12.80985 12.80985 12.80985 ZT20-23 21.502299999999998 21.502299999999998 21.502299999999998