condition mean min max ZT0-3 3.0395525 2.9974350000000003 3.08167 ZT4-7 6.47092 6.47092 6.47092 ZT8-11 9.67524 9.67524 9.67524 ZT12-15 0 0 0 ZT16-19 5.4112 5.4112 5.4112 ZT20-23 6.232279999999999 6.232279999999999 6.232279999999999