condition mean min max ZT0-3 32.84661666666667 29.497700000000002 35.0169 ZT4-7 11.400220000000001 11.400220000000001 11.400220000000001 ZT8-11 7.740015 7.740015 7.740015 ZT12-15 12.834125 10.798549999999999 14.869700000000002 ZT16-19 12.361519999999999 12.361519999999999 12.361519999999999 ZT20-23 16.94805 16.94805 16.94805