condition mean min max ZT0-3 0.5035343333333333 0.478738 0.522275 ZT4-7 0.5608735 0.5608735 0.5608735 ZT8-11 0.6997344999999999 0.6997344999999999 0.6997344999999999 ZT12-15 1.1746112499999999 1.147505 1.2017175 ZT16-19 0.7562145 0.7562145 0.7562145 ZT20-23 0.7646575 0.7646575 0.7646575