condition mean min max ZT0-3 493.360861 493.360861 493.360861 ZT4-7 370.3050255 370.3050255 370.3050255 ZT8-11 469.254073 469.254073 469.254073 ZT12-15 461.919193 461.919193 461.919193 ZT16-19 481.70833 481.70833 481.70833 ZT20-23 378.928333 378.928333 378.928333