condition mean min max ZT0-3 313.957863 313.957863 313.957863 ZT4-7 300.5012875 300.5012875 300.5012875 ZT8-11 305.798906 305.798906 305.798906 ZT12-15 261.347441 261.347441 261.347441 ZT16-19 358.2705185 358.2705185 358.2705185 ZT20-23 385.2794005 385.2794005 385.2794005