condition mean min max ZT0-3 2406.75 2406.75 2406.75 ZT4-7 1603.6 1603.6 1603.6 ZT8-11 1835.25 1835.25 1835.25 ZT12-15 1840.1999999999998 1840.1999999999998 1840.1999999999998 ZT16-19 2013.75 2013.75 2013.75 ZT20-23 2008.3 2008.3 2008.3