condition mean min max ZT0-3 11.34281 10.16507 12.52055 ZT4-7 6.2041900000000005 6.2041900000000005 6.2041900000000005 ZT8-11 3.52854 3.52854 3.52854 ZT12-15 0 0 0 ZT16-19 7.696065 7.696065 7.696065 ZT20-23 8.7637 8.7637 8.7637