condition mean min max ZT0-3 21.262225 17.1122 25.41225 ZT4-7 944.902 944.902 944.902 ZT8-11 845.842 845.842 845.842 ZT12-15 0 0 0 ZT16-19 0.79312 0.79312 0.79312 ZT20-23 7.569885 7.569885 7.569885