condition mean min max ZT0-3 51.36361666666667 41.015950000000004 62.291850000000004 ZT4-7 27.34275 27.34275 27.34275 ZT8-11 33.74435 33.74435 33.74435 ZT12-15 91.409175 78.81035 104.00800000000001 ZT16-19 76.12035 76.12035 76.12035 ZT20-23 82.9468 82.9468 82.9468