condition mean min max ZT0-3 0.32031125 0.2868085 0.35381399999999996 ZT4-7 0.46737300000000004 0.46737300000000004 0.46737300000000004 ZT8-11 0.467857 0.467857 0.467857 ZT12-15 0 0 0 ZT16-19 0.63475 0.63475 0.63475 ZT20-23 0.6723515 0.6723515 0.6723515