condition mean min max ZT0-3 17.840014 17.840014 17.840014 ZT4-7 41.0629875 41.0629875 41.0629875 ZT8-11 179.33623599999999 179.33623599999999 179.33623599999999 ZT12-15 140.665906 140.665906 140.665906 ZT16-19 209.0932335 209.0932335 209.0932335 ZT20-23 206.68715100000003 206.68715100000003 206.68715100000003