condition mean min max ZT0-3 0.44279 0.44279 0.44279 ZT4-7 0.3495155 0.3495155 0.3495155 ZT8-11 0.1685768 0.1685768 0.1685768 ZT12-15 0.26912650000000005 0.26912650000000005 0.26912650000000005 ZT16-19 0.35535 0.35535 0.35535 ZT20-23 0.2857885 0.2857885 0.2857885