condition mean min max ZT0-3 1.3507519700000001 1.1801648500000002 1.52133909 ZT4-7 1.5927748552499998 1.001851892 2.1836978184999998 ZT8-11 9.3338083415 5.659946343 13.00767034 ZT12-15 14.938986036 14.177922257 15.700049815 ZT16-19 13.07081286 11.514736280000001 14.62688944 ZT20-23 19.270111182500003 18.57535912 19.964863245