condition mean min max ZT0-3 1.051086 0.909173 1.284548 ZT4-7 2.530645 2.530645 2.530645 ZT8-11 11.92157 11.92157 11.92157 ZT12-15 6.0064525 5.80012 6.212785 ZT16-19 5.416385 5.416385 5.416385 ZT20-23 2.3761650000000003 2.3761650000000003 2.3761650000000003