condition mean min max ZT0-3 0.25788866666666665 0.1369175 0.330427 ZT4-7 0.0 0.0 0.0 ZT8-11 2.52308 2.52308 2.52308 ZT12-15 3.296495 2.2768800000000002 4.31611 ZT16-19 2.27677 2.27677 2.27677 ZT20-23 1.3579284999999999 1.3579284999999999 1.3579284999999999