condition mean min max ZT0-3 5.784459900250001 4.690040896 6.8788789045000005 ZT4-7 15.276884161000002 9.563474182 20.990294140000003 ZT8-11 32.68238528 30.262805285 35.101965275 ZT12-15 19.176809355 14.711771885 23.641846825000002 ZT16-19 17.22667285 14.680207939999999 19.77313776 ZT20-23 22.435343125 21.316222015 23.554464234999998