condition mean min max ZT0-3 7.58783 7.56053 7.615130000000001 ZT4-7 8.645430000000001 8.645430000000001 8.645430000000001 ZT8-11 22.2581 22.2581 22.2581 ZT12-15 0 0 0 ZT16-19 22.86905 22.86905 22.86905 ZT20-23 13.406649999999999 13.406649999999999 13.406649999999999