condition mean min max ZT0-3 48.5751 48.5751 48.5751 ZT4-7 41.36825 41.36825 41.36825 ZT8-11 49.274699999999996 49.274699999999996 49.274699999999996 ZT12-15 50.3203 50.3203 50.3203 ZT16-19 50.3617 50.3617 50.3617 ZT20-23 50.6093 50.6093 50.6093