condition mean min max ZT0-3 183.462826 183.462826 183.462826 ZT4-7 198.83477299999998 198.83477299999998 198.83477299999998 ZT8-11 228.02149500000002 228.02149500000002 228.02149500000002 ZT12-15 223.89153 223.89153 223.89153 ZT16-19 255.15780949999998 255.15780949999998 255.15780949999998 ZT20-23 246.19628699999998 246.19628699999998 246.19628699999998