condition mean min max ZT0-3 2.76756 2.494445 3.0406750000000002 ZT4-7 1.56446 1.56446 1.56446 ZT8-11 2.85695 2.85695 2.85695 ZT12-15 0 0 0 ZT16-19 3.203435 3.203435 3.203435 ZT20-23 2.607665 2.607665 2.607665