condition mean min max ZT0-3 2.6637825 1.791855 3.53571 ZT4-7 3.588165 3.588165 3.588165 ZT8-11 8.31423 8.31423 8.31423 ZT12-15 0 0 0 ZT16-19 5.28247 5.28247 5.28247 ZT20-23 4.720219999999999 4.720219999999999 4.720219999999999