condition mean min max ZT0-3 29.52665 29.52665 29.52665 ZT4-7 15.837499999999999 15.837499999999999 15.837499999999999 ZT8-11 14.780999999999999 14.780999999999999 14.780999999999999 ZT12-15 18.06495 18.06495 18.06495 ZT16-19 30.40935 30.40935 30.40935 ZT20-23 34.1061 34.1061 34.1061