condition mean min max ZT0-3 5.145853333333333 3.629645 7.333945 ZT4-7 8.256255 8.256255 8.256255 ZT8-11 5.38204 5.38204 5.38204 ZT12-15 9.1850775 8.624855 9.7453 ZT16-19 6.71734 6.71734 6.71734 ZT20-23 5.434060000000001 5.434060000000001 5.434060000000001