condition mean min max ZT0-3 0.99870375 0.940634 1.0567735 ZT4-7 1.47133 1.47133 1.47133 ZT8-11 1.76522 1.76522 1.76522 ZT12-15 1.7072375000000002 1.5792350000000002 1.83524 ZT16-19 1.6464711666666667 1.4616823333333333 1.83126 ZT20-23 0 0 0