condition mean min max ZT0-3 14.549227 14.549227 14.549227 ZT4-7 11.1681585 11.1681585 11.1681585 ZT8-11 10.458039500000002 10.458039500000002 10.458039500000002 ZT12-15 14.358250000000002 14.358250000000002 14.358250000000002 ZT16-19 12.363627000000001 12.363627000000001 12.363627000000001 ZT20-23 10.416412000000001 10.416412000000001 10.416412000000001