condition mean min max ZT0-3 144.232057 144.232057 144.232057 ZT4-7 171.5002915 171.5002915 171.5002915 ZT8-11 193.71394800000002 193.71394800000002 193.71394800000002 ZT12-15 181.85501349999998 181.85501349999998 181.85501349999998 ZT16-19 180.311495 180.311495 180.311495 ZT20-23 182.5665725 182.5665725 182.5665725