condition mean min max ZT0-3 0.37518133333333337 0.2625265 0.5982500000000001 ZT4-7 0.1583065 0.1583065 0.1583065 ZT8-11 2.7356550000000004 2.7356550000000004 2.7356550000000004 ZT12-15 2.980105 2.153485 3.806725 ZT16-19 2.200495 2.200495 2.200495 ZT20-23 1.753425 1.753425 1.753425