condition mean min max ZT0-3 1238.0 1238.0 1238.0 ZT4-7 2012.2 2012.2 2012.2 ZT8-11 2074.55 2074.55 2074.55 ZT12-15 2200.0 2200.0 2200.0 ZT16-19 1838.7 1838.7 1838.7 ZT20-23 1015.25 1015.25 1015.25