condition mean min max ZT0-3 31.69704599916667 29.396792675 33.99729932333334 ZT4-7 42.553357825 37.85788212 47.24883353 ZT8-11 50.837021504999996 48.78364933666666 52.890393673333335 ZT12-15 67.367657915 61.64526083333333 73.09005499666667 ZT16-19 58.709999968333335 57.42861002666667 59.99138991 ZT20-23 52.401249789999994 51.24981244 53.552687139999996