condition mean min max ZT0-3 18.0524824525 12.08446901 24.020495895 ZT4-7 24.603077845 22.5948908 26.61126489 ZT8-11 26.229497984999995 25.539257319999997 26.919738649999996 ZT12-15 30.41156014 19.523081570000002 41.300038709999995 ZT16-19 71.12125764000001 64.64907476 77.59344052 ZT20-23 68.443184075 58.67923226 78.20713589