condition mean min max ZT0-3 49.8949 49.8949 49.8949 ZT4-7 25.48035 25.48035 25.48035 ZT8-11 23.95845 23.95845 23.95845 ZT12-15 26.9178 26.9178 26.9178 ZT16-19 44.683800000000005 44.683800000000005 44.683800000000005 ZT20-23 55.91525 55.91525 55.91525