condition mean min max ZT0-3 1455.874703 1455.874703 1455.874703 ZT4-7 1562.087144 1562.087144 1562.087144 ZT8-11 1646.7973225 1646.7973225 1646.7973225 ZT12-15 1729.9777765 1729.9777765 1729.9777765 ZT16-19 1489.394809 1489.394809 1489.394809 ZT20-23 1115.241925 1115.241925 1115.241925