condition mean min max ZT0-3 0.369245 0.369245 0.369245 ZT4-7 0.119841 0.119841 0.119841 ZT8-11 0.938739 0.938739 0.938739 ZT12-15 2.479174 2.479174 2.479174 ZT16-19 1.407347 1.407347 1.407347 ZT20-23 0.48829500000000003 0.48829500000000003 0.48829500000000003