condition mean min max ZT0-3 63.068349999999995 36.48145 89.65525 ZT4-7 66.59344999999999 66.59344999999999 66.59344999999999 ZT8-11 64.0145 64.0145 64.0145 ZT12-15 0 0 0 ZT16-19 44.17815 44.17815 44.17815 ZT20-23 25.06505 25.06505 25.06505