condition mean min max ZT0-3 50.05287745 48.4746462 51.6311087 ZT4-7 66.26192155666666 63.95489588 68.56894723333333 ZT8-11 67.95971556500001 65.25838612000001 70.66104501 ZT12-15 86.99673767833333 80.51986541666666 93.47360994 ZT16-19 113.54491438333335 111.49531060000001 115.59451816666667 ZT20-23 104.808182235 100.47013863666668 109.14622583333333