condition mean min max ZT0-3 8.52296 8.52296 8.52296 ZT4-7 9.654642 9.654642 9.654642 ZT8-11 9.186150000000001 9.186150000000001 9.186150000000001 ZT12-15 8.197403999999999 8.197403999999999 8.197403999999999 ZT16-19 9.4329455 9.4329455 9.4329455 ZT20-23 8.178960499999999 8.178960499999999 8.178960499999999