condition mean min max ZT0-3 1.7563650000000002 1.570545 1.942185 ZT4-7 0.7075115 0.7075115 0.7075115 ZT8-11 1.0675915 1.0675915 1.0675915 ZT12-15 0 0 0 ZT16-19 1.0425039999999999 1.0425039999999999 1.0425039999999999 ZT20-23 1.394625 1.394625 1.394625