condition mean min max ZT0-3 25.059001695 23.10965839 27.008345 ZT4-7 46.550195142499994 38.36863516 54.73175512499999 ZT8-11 79.3917557325 66.89435805 91.889153415 ZT12-15 63.7496219375 50.340453190000005 77.158790685 ZT16-19 37.03673807 35.331676365 38.741799775000004 ZT20-23 34.233611592500004 33.837387930000006 34.629835255