condition mean min max ZT0-3 276.559814 276.559814 276.559814 ZT4-7 203.167473 203.167473 203.167473 ZT8-11 222.675661 222.675661 222.675661 ZT12-15 238.619501 238.619501 238.619501 ZT16-19 373.687072 373.687072 373.687072 ZT20-23 625.8856685000001 625.8856685000001 625.8856685000001