condition mean min max ZT0-3 21.437272175000004 18.36659372 24.507950630000003 ZT4-7 5.1652692335 2.1740982505 8.1564402165 ZT8-11 11.050048906499999 4.627835115 17.472262697999998 ZT12-15 13.591062045000001 11.247772950000002 15.93435114 ZT16-19 12.959439547 10.607822539 15.311056555 ZT20-23 8.4150838965 7.946137138999999 8.884030654