condition mean min max ZT0-3 23.25945 21.8754 24.6435 ZT4-7 19.5001 19.5001 19.5001 ZT8-11 3.274695 3.274695 3.274695 ZT12-15 0 0 0 ZT16-19 10.345945 10.345945 10.345945 ZT20-23 25.43215 25.43215 25.43215