condition mean min max ZT0-3 9.9151338295 7.532489924 12.297777735 ZT4-7 12.501218911 10.951984692 14.050453130000001 ZT8-11 5.333301100249999 4.731257069 5.935345131499999 ZT12-15 3.1577450454999996 2.310822579 4.004667511999999 ZT16-19 2.1964352695000002 1.8661300465000001 2.5267404925 ZT20-23 1.56423133275 0.8061832525 2.322279413