condition mean min max ZT0-3 0.6080243145 0.41295565700000003 0.8030929720000001 ZT4-7 0.06878935075 0.045526131 0.0920525705 ZT8-11 0.6762656435000001 0.3620500515 0.9904812355 ZT12-15 2.71086410575 1.719385805 3.7023424064999997 ZT16-19 3.49510368225 3.1813329425 3.8088744219999997 ZT20-23 3.4457188875 2.568209255 4.32322852