condition mean min max ZT0-3 12.6532656475 12.544588990000001 12.761942305 ZT4-7 10.7623506875 9.948527965 11.576173409999999 ZT8-11 10.272860373666667 10.097287081 10.448433666333333 ZT12-15 8.006253782666667 7.285385045333333 8.72712252 ZT16-19 8.5877061945 8.022761824 9.152650565 ZT20-23 6.287054051666667 5.887208547666666 6.686899555666667