condition mean min max ZT0-3 1.3553223333333333 1.2767 1.417665 ZT4-7 0.690411 0.690411 0.690411 ZT8-11 0.3620655 0.3620655 0.3620655 ZT12-15 0.66947075 0.579831 0.7591105 ZT16-19 0.4553165 0.4553165 0.4553165 ZT20-23 0.9436225 0.9436225 0.9436225