condition mean min max ZT0-3 219.569575 219.569575 219.569575 ZT4-7 463.7417955 463.7417955 463.7417955 ZT8-11 518.6357399999999 518.6357399999999 518.6357399999999 ZT12-15 415.78587300000004 415.78587300000004 415.78587300000004 ZT16-19 372.60919850000005 372.60919850000005 372.60919850000005 ZT20-23 353.98894 353.98894 353.98894