condition mean min max ZT0-3 789.5999999999999 789.5999999999999 789.5999999999999 ZT4-7 654.2 654.2 654.2 ZT8-11 491.20000000000005 491.20000000000005 491.20000000000005 ZT12-15 579.0 579.0 579.0 ZT16-19 609.3 609.3 609.3 ZT20-23 728.25 728.25 728.25