condition mean min max ZT0-3 12.862357 12.862357 12.862357 ZT4-7 11.8019125 11.8019125 11.8019125 ZT8-11 12.1928155 12.1928155 12.1928155 ZT12-15 13.544039000000001 13.544039000000001 13.544039000000001 ZT16-19 12.96409 12.96409 12.96409 ZT20-23 11.1265505 11.1265505 11.1265505