condition mean min max ZT0-3 104.047138 104.047138 104.047138 ZT4-7 210.464385 210.464385 210.464385 ZT8-11 259.5517355 259.5517355 259.5517355 ZT12-15 233.8796535 233.8796535 233.8796535 ZT16-19 168.26710200000002 168.26710200000002 168.26710200000002 ZT20-23 180.69962600000002 180.69962600000002 180.69962600000002