condition mean min max ZT0-3 40.22191430583334 34.975478255 45.46835035666667 ZT4-7 49.63534662 43.95961693 55.31107631 ZT8-11 57.261886625 55.26875995 59.2550133 ZT12-15 58.957460426666664 55.95575993666667 61.95916091666666 ZT16-19 70.55210929166665 70.17115596 70.93306262333333 ZT20-23 62.651917655000005 54.765912039999996 70.53792327000001