condition mean min max ZT0-3 37.9480599925 26.13356121 49.762558775 ZT4-7 73.94304301 73.469721435 74.416364585 ZT8-11 39.36449233250001 28.10123198 50.627752685000004 ZT12-15 15.501165527500001 15.104486805 15.897844250000002 ZT16-19 19.766967995 17.855127215 21.678808775 ZT20-23 8.962380112750001 6.6090036085 11.315756617