condition mean min max ZT0-3 40.79399410416667 39.18926500333333 42.398723205 ZT4-7 46.60057583 45.70800447333333 47.49314718666667 ZT8-11 68.18271842166666 61.33375068 75.03168616333333 ZT12-15 75.90860089 74.53117803 77.28602375 ZT16-19 77.35789636166666 74.50582021333334 80.20997251 ZT20-23 75.00908172833334 69.24967527333334 80.76848818333333