condition mean min max ZT0-3 37.700012 37.700012 37.700012 ZT4-7 32.1730865 32.1730865 32.1730865 ZT8-11 30.568640000000002 30.568640000000002 30.568640000000002 ZT12-15 31.546613 31.546613 31.546613 ZT16-19 16.776998 16.776998 16.776998 ZT20-23 15.869903 15.869903 15.869903