condition mean min max ZT0-3 584.192419 584.192419 584.192419 ZT4-7 544.229828 544.229828 544.229828 ZT8-11 536.5231985 536.5231985 536.5231985 ZT12-15 556.7989964999999 556.7989964999999 556.7989964999999 ZT16-19 601.351893 601.351893 601.351893 ZT20-23 660.109072 660.109072 660.109072