condition mean min max ZT0-3 29.158798 29.158798 29.158798 ZT4-7 33.8809645 33.8809645 33.8809645 ZT8-11 33.8858625 33.8858625 33.8858625 ZT12-15 91.030006 91.030006 91.030006 ZT16-19 63.535517 63.535517 63.535517 ZT20-23 81.23526100000001 81.23526100000001 81.23526100000001