condition mean min max ZT0-3 10.8271517015 9.891065663000001 11.76323774 ZT4-7 7.644799177 7.3007357715 7.9888625825 ZT8-11 9.7334636375 8.030919845 11.43600743 ZT12-15 6.62200854625 6.3550246455 6.888992447 ZT16-19 8.23212050475 7.748059465000001 8.7161815445 ZT20-23 12.01283741 11.31419585 12.71147897