condition mean min max ZT0-3 14.511425 13.681049999999999 15.3418 ZT4-7 10.29362 10.29362 10.29362 ZT8-11 7.619815 7.619815 7.619815 ZT12-15 0 0 0 ZT16-19 9.01906 9.01906 9.01906 ZT20-23 13.4946 13.4946 13.4946