condition mean min max ZT0-3 15.7029 15.7029 15.7029 ZT4-7 26.662300000000002 26.662300000000002 26.662300000000002 ZT8-11 7.7704249999999995 7.7704249999999995 7.7704249999999995 ZT12-15 3.3546750000000003 3.3546750000000003 3.3546750000000003 ZT16-19 1.260775 1.260775 1.260775 ZT20-23 2.7969150000000003 2.7969150000000003 2.7969150000000003