condition mean min max ZT0-3 1.139135 0.9809334999999999 1.2973365000000001 ZT4-7 0.964555 0.964555 0.964555 ZT8-11 2.6206899999999997 2.6206899999999997 2.6206899999999997 ZT12-15 0 0 0 ZT16-19 2.808375 2.808375 2.808375 ZT20-23 1.5932499999999998 1.5932499999999998 1.5932499999999998