condition mean min max ZT0-3 1.3536422499999998 0.5973845 2.1098999999999997 ZT4-7 0.425491 0.425491 0.425491 ZT8-11 0.18215599999999998 0.18215599999999998 0.18215599999999998 ZT12-15 0 0 0 ZT16-19 0.7108019999999999 0.7108019999999999 0.7108019999999999 ZT20-23 0.4166105 0.4166105 0.4166105