condition mean min max ZT0-3 0.478132004 0.251663471 0.7046005369999999 ZT4-7 2.344437055 1.4390000045 3.2498741055 ZT8-11 4.71540357425 4.219790564 5.211016584499999 ZT12-15 4.2671037115 3.7804579159999996 4.753749507 ZT16-19 2.7348671602500003 2.6588544880000002 2.8108798325000004 ZT20-23 2.8487891427500003 2.727092321 2.9704859645000004