condition mean min max ZT0-3 80.778997 80.778997 80.778997 ZT4-7 48.5972505 48.5972505 48.5972505 ZT8-11 37.797079 37.797079 37.797079 ZT12-15 63.7973635 63.7973635 63.7973635 ZT16-19 36.338724 36.338724 36.338724 ZT20-23 41.91891 41.91891 41.91891