condition mean min max ZT0-3 606.830182 606.830182 606.830182 ZT4-7 611.950879 611.950879 611.950879 ZT8-11 602.9000405 602.9000405 602.9000405 ZT12-15 613.21416 613.21416 613.21416 ZT16-19 664.0393895 664.0393895 664.0393895 ZT20-23 700.964509 700.964509 700.964509