condition mean min max ZT0-3 1.24663625 0.8335115 1.659761 ZT4-7 1.15938 1.15938 1.15938 ZT8-11 0.709658 0.709658 0.709658 ZT12-15 0 0 0 ZT16-19 2.94395 2.94395 2.94395 ZT20-23 3.29474 3.29474 3.29474