condition mean min max ZT0-3 1.4783295614999998 1.186764517 1.7698946059999998 ZT4-7 4.33264198475 2.98473796 5.6805460095 ZT8-11 7.933027333 6.362642232500001 9.5034124335 ZT12-15 4.46736018075 2.134892941 6.7998274205 ZT16-19 1.1434725695 0.8007796635 1.4861654755 ZT20-23 0.25723849525 0.11497930349999999 0.399497687