condition mean min max ZT0-3 30.69652232 27.09149074 34.3015539 ZT4-7 13.56800188175 12.2243120585 14.911691704999999 ZT8-11 23.839942255 15.36833423 32.31155028 ZT12-15 28.7811401475 27.412646705 30.14963359 ZT16-19 30.188415325 26.951810074999997 33.425020575000005 ZT20-23 22.084312845 19.501941195 24.666684495