condition mean min max ZT0-3 12.490539 12.490539 12.490539 ZT4-7 12.5810305 12.5810305 12.5810305 ZT8-11 11.110790999999999 11.110790999999999 11.110790999999999 ZT12-15 11.2409635 11.2409635 11.2409635 ZT16-19 11.988159 11.988159 11.988159 ZT20-23 10.75876 10.75876 10.75876