condition mean min max ZT0-3 15.996883 15.996883 15.996883 ZT4-7 14.827570999999999 14.827570999999999 14.827570999999999 ZT8-11 16.215963 16.215963 16.215963 ZT12-15 16.240185 16.240185 16.240185 ZT16-19 11.354594500000001 11.354594500000001 11.354594500000001 ZT20-23 13.461365 13.461365 13.461365