condition mean min max ZT0-3 248.79999999999998 248.79999999999998 248.79999999999998 ZT4-7 249.1 249.1 249.1 ZT8-11 208.65 208.65 208.65 ZT12-15 316.45 316.45 316.45 ZT16-19 363.95000000000005 363.95000000000005 363.95000000000005 ZT20-23 317.79999999999995 317.79999999999995 317.79999999999995