condition mean min max ZT0-3 1292.636182 1292.636182 1292.636182 ZT4-7 1386.8926984999998 1386.8926984999998 1386.8926984999998 ZT8-11 1817.7406165 1817.7406165 1817.7406165 ZT12-15 1884.3273574999998 1884.3273574999998 1884.3273574999998 ZT16-19 1582.1786875 1582.1786875 1582.1786875 ZT20-23 1129.4242095 1129.4242095 1129.4242095