condition mean min max ZT0-3 235.371277 235.371277 235.371277 ZT4-7 137.727426 137.727426 137.727426 ZT8-11 71.47192749999999 71.47192749999999 71.47192749999999 ZT12-15 87.734797 87.734797 87.734797 ZT16-19 117.655416 117.655416 117.655416 ZT20-23 221.8483865 221.8483865 221.8483865