condition mean min max ZT0-3 0.5379561666666667 0.301744 0.768548 ZT4-7 0.1827675 0.1827675 0.1827675 ZT8-11 0.534634 0.534634 0.534634 ZT12-15 1.0297695 0.849774 1.209765 ZT16-19 1.2239849999999999 1.2239849999999999 1.2239849999999999 ZT20-23 1.256575 1.256575 1.256575