condition mean min max ZT0-3 0.1677705 0.1331795 0.20236149999999997 ZT4-7 0.27253499999999997 0.27253499999999997 0.27253499999999997 ZT8-11 0.405956 0.405956 0.405956 ZT12-15 0 0 0 ZT16-19 0.2656205 0.2656205 0.2656205 ZT20-23 0.2655765 0.2655765 0.2655765