condition mean min max ZT0-3 0.0113576505 0.0 0.022715301 ZT4-7 0.94317045325 0.34260409849999995 1.543736808 ZT8-11 7.07187375325 5.937717738 8.2060297685 ZT12-15 36.0004775425 31.470955195000002 40.52999989 ZT16-19 24.8671734675 20.76994766 28.964399274999998 ZT20-23 14.18007976175 12.2666916535 16.093467869999998