condition mean min max ZT0-3 1.03969286375 0.895371444 1.1840142835 ZT4-7 2.09638454325 1.663100856 2.5296682305 ZT8-11 3.173527641 2.763977057 3.5830782250000004 ZT12-15 3.03014866825 2.9230142755 3.1372830609999998 ZT16-19 3.9415040685 3.3624887059999997 4.520519431 ZT20-23 7.168614451750001 6.6122550985 7.724973805