condition mean min max ZT0-3 2.2891150000000002 2.0535 2.7521500000000003 ZT4-7 2.2851150000000002 2.2851150000000002 2.2851150000000002 ZT8-11 2.09367 2.09367 2.09367 ZT12-15 2.5842475 2.04337 3.1251249999999997 ZT16-19 2.144175 2.144175 2.144175 ZT20-23 3.0908949999999997 3.0908949999999997 3.0908949999999997