condition mean min max ZT0-3 0.36306725000000006 0.204706 0.5214285000000001 ZT4-7 0.886936 0.886936 0.886936 ZT8-11 0.468341 0.468341 0.468341 ZT12-15 0 0 0 ZT16-19 0.922392 0.922392 0.922392 ZT20-23 1.3379125 1.3379125 1.3379125