condition mean min max ZT0-3 7.41183 7.41183 7.41183 ZT4-7 3.54461 3.54461 3.54461 ZT8-11 5.629 5.629 5.629 ZT12-15 7.7696950000000005 7.7696950000000005 7.7696950000000005 ZT16-19 13.69555 13.69555 13.69555 ZT20-23 5.013655 5.013655 5.013655