condition mean min max ZT0-3 51.57888889 51.57888889 51.57888889 ZT4-7 304.3711111 304.3711111 304.3711111 ZT8-11 400.09888889999996 400.09888889999996 400.09888889999996 ZT12-15 204.74111109999998 204.74111109999998 204.74111109999998 ZT16-19 84.37888888666667 84.37888888666667 84.37888888666667 ZT20-23 47.345555553333334 47.345555553333334 47.345555553333334