condition mean min max ZT0-3 5.0935825 4.91306 5.2741050000000005 ZT4-7 2.411885 2.411885 2.411885 ZT8-11 3.1537050000000004 3.1537050000000004 3.1537050000000004 ZT12-15 0 0 0 ZT16-19 7.70552 7.70552 7.70552 ZT20-23 6.23621 6.23621 6.23621