condition mean min max ZT0-3 0.338524 0.338524 0.338524 ZT4-7 0.193529 0.193529 0.193529 ZT8-11 0.242089 0.242089 0.242089 ZT12-15 0.30050200000000005 0.30050200000000005 0.30050200000000005 ZT16-19 0.656755 0.656755 0.656755 ZT20-23 0.49465200000000004 0.49465200000000004 0.49465200000000004