condition mean min max ZT0-3 4.73983485475 4.604869626499999 4.874800083 ZT4-7 6.966804189 4.507377823500001 9.4262305545 ZT8-11 12.159659342000001 10.731725139 13.587593545 ZT12-15 11.887043228749999 11.747893815 12.0261926425 ZT16-19 6.01863015825 5.9468479125 6.090412404 ZT20-23 7.96447841525 7.1136682305 8.8152886