condition mean min max ZT0-3 0.260077 0.260077 0.260077 ZT4-7 0.1601885 0.1601885 0.1601885 ZT8-11 0.29144950000000003 0.29144950000000003 0.29144950000000003 ZT12-15 0.358315 0.358315 0.358315 ZT16-19 0.5814575 0.5814575 0.5814575 ZT20-23 0.3839635 0.3839635 0.3839635