condition mean min max ZT0-3 12.118304989499999 5.979860085666666 18.256749893333332 ZT4-7 32.48440283 23.42831506 41.5404906 ZT8-11 24.591953178333334 18.83950951 30.34439684666667 ZT12-15 15.695010235000002 15.381820430000001 16.008200040000002 ZT16-19 11.8679975665 11.025559372 12.710435761 ZT20-23 9.027358671333333 7.6484852273333335 10.406232115333333