condition mean min max ZT0-3 53.564938995000006 47.96019082 59.16968717 ZT4-7 46.428099579999994 43.838164 49.01803516 ZT8-11 49.093774915 46.11493634 52.07261349 ZT12-15 57.83817652666667 53.20423841 62.472114643333335 ZT16-19 71.40992624666666 68.27930846666666 74.54054402666667 ZT20-23 73.66180076333333 73.05714746000001 74.26645406666667