condition mean min max ZT0-3 19.36304 19.36304 19.36304 ZT4-7 17.1274855 17.1274855 17.1274855 ZT8-11 16.3847245 16.3847245 16.3847245 ZT12-15 18.7373735 18.7373735 18.7373735 ZT16-19 21.098388 21.098388 21.098388 ZT20-23 18.556245500000003 18.556245500000003 18.556245500000003