condition mean min max ZT0-3 12.60355 11.6617 13.472549999999998 ZT4-7 10.042655 10.042655 10.042655 ZT8-11 29.24475 29.24475 29.24475 ZT12-15 43.04055 39.10625 46.97485 ZT16-19 33.18425 33.18425 33.18425 ZT20-23 19.4404 19.4404 19.4404