condition mean min max ZT0-3 210.5911111 210.5911111 210.5911111 ZT4-7 169.5361111 169.5361111 169.5361111 ZT8-11 152.44 152.44 152.44 ZT12-15 197.8777778 197.8777778 197.8777778 ZT16-19 278.4188889 278.4188889 278.4188889 ZT20-23 310.2344444666667 310.2344444666667 310.2344444666667