condition mean min max ZT0-3 0.27613750000000004 0.27613750000000004 0.27613750000000004 ZT4-7 0.2912055 0.2912055 0.2912055 ZT8-11 0.25181699999999996 0.25181699999999996 0.25181699999999996 ZT12-15 0.576954 0.576954 0.576954 ZT16-19 0.779344 0.779344 0.779344 ZT20-23 0.448496 0.448496 0.448496