condition mean min max ZT0-3 0.499752 0.4970325 0.5024715 ZT4-7 0.8143075 0.8143075 0.8143075 ZT8-11 0.3795145 0.3795145 0.3795145 ZT12-15 0 0 0 ZT16-19 1.0494565 1.0494565 1.0494565 ZT20-23 0.620366 0.620366 0.620366