condition mean min max ZT0-3 12.704238 12.704238 12.704238 ZT4-7 11.7259575 11.7259575 11.7259575 ZT8-11 13.6480535 13.6480535 13.6480535 ZT12-15 12.7404815 12.7404815 12.7404815 ZT16-19 11.722845 11.722845 11.722845 ZT20-23 14.1900945 14.1900945 14.1900945