condition mean min max ZT0-3 14949.95 14949.95 14949.95 ZT4-7 16036.3 16036.3 16036.3 ZT8-11 18087.1 18087.1 18087.1 ZT12-15 15914.050000000001 15914.050000000001 15914.050000000001 ZT16-19 15567.449999999999 15567.449999999999 15567.449999999999 ZT20-23 16367.8 16367.8 16367.8