condition mean min max ZT0-3 15.531175000000001 13.9024 17.159950000000002 ZT4-7 11.4632 11.4632 11.4632 ZT8-11 22.572 22.572 22.572 ZT12-15 0 0 0 ZT16-19 37.72375 37.72375 37.72375 ZT20-23 21.22465 21.22465 21.22465