condition mean min max ZT0-3 15.238824999999999 14.31835 16.159299999999998 ZT4-7 22.40045 22.40045 22.40045 ZT8-11 10.34521 10.34521 10.34521 ZT12-15 0 0 0 ZT16-19 14.52935 14.52935 14.52935 ZT20-23 19.36205 19.36205 19.36205