condition mean min max ZT0-3 1.57343622025 1.348720739 1.7981517015 ZT4-7 1.665740104 1.392565828 1.93891438 ZT8-11 2.5084605910000004 2.1398744030000003 2.877046779 ZT12-15 3.3860299187500003 2.9591415860000003 3.8129182514999997 ZT16-19 4.82795996325 4.2073976994999995 5.448522227 ZT20-23 8.277839739000001 7.5043447075000005 9.0513347705