condition mean min max ZT0-3 24.382195330000002 24.01555072 24.74883994 ZT4-7 16.538000484999998 14.45015736 18.625843609999997 ZT8-11 25.3315142325 21.140448815 29.52257965 ZT12-15 24.1072886125 23.170625425 25.043951800000002 ZT16-19 18.47351914 18.350269785000002 18.596768495 ZT20-23 22.1936458875 21.349132695 23.03815908