condition mean min max ZT0-3 1.18242 1.18242 1.18242 ZT4-7 0.974696 0.974696 0.974696 ZT8-11 1.3086099999999998 1.3086099999999998 1.3086099999999998 ZT12-15 3.01816 3.01816 3.01816 ZT16-19 0.556284 0.556284 0.556284 ZT20-23 2.55789 2.55789 2.55789