condition mean min max ZT0-3 556.378607 556.378607 556.378607 ZT4-7 843.9118599999999 843.9118599999999 843.9118599999999 ZT8-11 734.8424705 734.8424705 734.8424705 ZT12-15 536.7812385 536.7812385 536.7812385 ZT16-19 574.480768 574.480768 574.480768 ZT20-23 640.1863845 640.1863845 640.1863845