condition mean min max ZT0-3 7593.847441 7593.847441 7593.847441 ZT4-7 7616.685197999999 7616.685197999999 7616.685197999999 ZT8-11 6436.2398945 6436.2398945 6436.2398945 ZT12-15 7199.461198999999 7199.461198999999 7199.461198999999 ZT16-19 6574.502485499999 6574.502485499999 6574.502485499999 ZT20-23 5877.351707 5877.351707 5877.351707