condition mean min max ZT0-3 11.199661265 8.478175735 13.921146794999999 ZT4-7 17.2514991825 15.315637895000002 19.18736047 ZT8-11 21.78501488 20.090058895 23.479970865 ZT12-15 12.954775564 11.2228885695 14.6866625585 ZT16-19 9.09838032325 8.421655531999999 9.7751051145 ZT20-23 9.53738085875 8.5511986875 10.52356303