condition mean min max ZT0-3 0.0501755 0.050097 0.050254 ZT4-7 0.1994925 0.1994925 0.1994925 ZT8-11 0.39990950000000003 0.39990950000000003 0.39990950000000003 ZT12-15 0 0 0 ZT16-19 0.6916975000000001 0.6916975000000001 0.6916975000000001 ZT20-23 0.445901 0.445901 0.445901