condition mean min max ZT0-3 49.1051835425 48.34807917 49.862287915 ZT4-7 43.058333766666664 42.98990698 43.126760553333334 ZT8-11 50.141155345 48.8224932 51.45981749 ZT12-15 56.174801114999994 53.443898839999996 58.90570339 ZT16-19 58.56115216833334 57.77807218 59.34423215666667 ZT20-23 57.294449285 56.84721637333333 57.741682196666666