condition mean min max ZT0-3 12.185124 12.185124 12.185124 ZT4-7 8.7617265 8.7617265 8.7617265 ZT8-11 8.014889499999999 8.014889499999999 8.014889499999999 ZT12-15 34.0979905 34.0979905 34.0979905 ZT16-19 10.134091 10.134091 10.134091 ZT20-23 16.8986455 16.8986455 16.8986455