condition mean min max ZT0-3 34.327593195 28.68083536 39.97435103 ZT4-7 29.02547036 28.851676230000002 29.19926449 ZT8-11 41.44608153 33.21685013 49.675312930000004 ZT12-15 49.50460796 48.465170785 50.544045135000005 ZT16-19 62.5604332175 61.653139159999995 63.467727275 ZT20-23 68.189381705 60.71149366 75.66726975