condition mean min max ZT0-3 249.47199999999998 249.47199999999998 249.47199999999998 ZT4-7 174.4235 174.4235 174.4235 ZT8-11 169.66 169.66 169.66 ZT12-15 278.587 278.587 278.587 ZT16-19 282.244 282.244 282.244 ZT20-23 279.81399999999996 279.81399999999996 279.81399999999996