condition mean min max ZT0-3 143.386442 143.386442 143.386442 ZT4-7 110.5636835 110.5636835 110.5636835 ZT8-11 133.955804 133.955804 133.955804 ZT12-15 168.700697 168.700697 168.700697 ZT16-19 162.1729545 162.1729545 162.1729545 ZT20-23 169.892332 169.892332 169.892332