condition mean min max ZT0-3 10.430916 10.430916 10.430916 ZT4-7 10.257090999999999 10.257090999999999 10.257090999999999 ZT8-11 8.944408500000002 8.944408500000002 8.944408500000002 ZT12-15 10.956636499999998 10.956636499999998 10.956636499999998 ZT16-19 10.736298 10.736298 10.736298 ZT20-23 10.430916 10.430916 10.430916