condition mean min max ZT0-3 1.7017666666666666 0.0 5.1053 ZT4-7 0.0 0.0 0.0 ZT8-11 5.11635 5.11635 5.11635 ZT12-15 10.392949999999999 5.11985 15.66605 ZT16-19 4.96053 4.96053 4.96053 ZT20-23 22.17475 22.17475 22.17475