condition mean min max ZT0-3 29.122222219999998 29.122222219999998 29.122222219999998 ZT4-7 41.11222222 41.11222222 41.11222222 ZT8-11 33.11888889 33.11888889 33.11888889 ZT12-15 26.855555553333332 26.855555553333332 26.855555553333332 ZT16-19 26.006666669999998 26.006666669999998 26.006666669999998 ZT20-23 28.21 28.21 28.21