condition mean min max ZT0-3 59.584775 52.687200000000004 66.48235 ZT4-7 19.0777 19.0777 19.0777 ZT8-11 16.4075 16.4075 16.4075 ZT12-15 0 0 0 ZT16-19 49.3741 49.3741 49.3741 ZT20-23 49.6792 49.6792 49.6792