condition mean min max ZT0-3 0.41169066666666665 0.3543475 0.4426615 ZT4-7 0.8582310000000001 0.8582310000000001 0.8582310000000001 ZT8-11 2.58032 2.58032 2.58032 ZT12-15 1.34408825 1.3289965000000001 1.35918 ZT16-19 0.924864 0.924864 0.924864 ZT20-23 1.62232 1.62232 1.62232