condition mean min max ZT0-3 25.82732 25.82732 25.82732 ZT4-7 16.168873 16.168873 16.168873 ZT8-11 17.559112 17.559112 17.559112 ZT12-15 14.079502 14.079502 14.079502 ZT16-19 12.5417485 12.5417485 12.5417485 ZT20-23 14.554140499999999 14.554140499999999 14.554140499999999